First step in two-part process to rename directories to kallithea.
This first step is to change all references in the files where they refer
to the old directory name.

Imported some of the GPLv3'd changes from RhodeCode v2.2.5.

This imports changes between changesets 21af6c4eab3d and 6177597791c2 in
RhodeCode's original repository, including only changes to Python files and HTML.

RhodeCode clearly licensed its changes to these files under GPLv3
in their /LICENSE file, which states the following:
The Python code and integrated HTML are licensed under the GPLv3 license.

(See:
https://code.rhodecode.com/rhodecode/files/v2.2.5/LICENSE
or
http://web.archive.org/web/20140512193334/https://code.rhodecode.com/rhodecode/files/f3b123159901f15426d18e3dc395e8369f70ebe0/LICENSE
for an online copy of that LICENSE file)

Conservancy reviewed these changes and confirmed that they can be licensed as
a whole to the Kallithea project under GPLv3-only.

While some of the contents committed herein are clearly licensed
GPLv3-or-later, on the whole we must assume the are GPLv3-only, since the
statement above from RhodeCode indicates that they intend GPLv3-only as their
license, per GPLv3§14 and other relevant sections of GPLv3.

Implemented simple gist functionality ref #530.

- creation of public/private gists with given lifetime
- rhodecode-gist CLI for quick gist creation

diff parser: redefined operations stats for changes

- don't loose info about multiple operations like rename + chmod
- new Binary flag when dealing with binary file operations
- fixed diffs after mercurial 2.6 when GIT binary diffs were fixed
- added more tests for multiple operations

- refactored the way diffprocessor returns data. It's
now easier to extract type of operation on binary files
- diffprocessor doesn't append that information into the diff itself

diff parser: prefer git headers over old unified diff headers

Makes the diff show both rename and chmod info and the diff.

diff parser: more correct detection and reporting of binary git diffs

git mode is not just used for binary diffs.

diff parser: match the header order of hg diff --git patches

The output might look like:

diff --git a/A b/B
old mode 100644
new mode 100755
rename from A
rename to B
--- a/A
+++ b/B

Such files were shown as 'modified binary file chmod 100644 => 100755' without
diff.

Now the chmod and diff will be shown ... but still not the rename.

Correct parsing of headers do require a better parser - one do not just use a
regexp.

diffs: drop diffs.differ

This function did not really add any value, it was yet another layer that was
hiding the bug that we use ref[1] without ref[0], and it had this strange
undefined behaviour for diffing across repos.

Inlining the call to .get_diff do not make the code more complex but makes it
more obvious what is going on so it can be cleaned up later.

follow Python conventions for boolean values

True and False might be singletons and the "default" values for "boolean"
expressions, but "all" values in Python has a boolean value and should be
evaluated as such. Checking with 'is True' and 'is False' is thus confusing,
error prone and unnessarily complex.

If we anywhere rely and nullable boolean fields from the database layer and
don't want the null value to be treated as False then we should check
explicitly for null with 'is None'.

compare: show aggregated diff of what will be merged to other repo, using merge ancestor

pull_request.get_compare_data will also now return the ancestor that would be
used for actual merging. Showing a diff from that ancestor instead of the first
'new' changeset will give a more realistic diff that doesn't include merges.

compare and diff: remove unused "bundle" functionality

The 'bundle' parameter was never set, incoming_changesets was thus always
False, remote_compare was thus always False, and InMemoryBundleRepo and
bundlerepo was neverused.

fixes issue #678 Incorrect diff markup when diff contains >, <, or & symbols
- regex by \W did split &amp; and other to 3 tokens, and escaping was broken

Basic implementation of cherry picking changesets
for pull request, ref #575

Fixed issue with inproper handling of diff parsing that could lead to infinit loops.
This was an edge case when diff contained diff data inside. Regresion test was
added

Multiple changes for compare system
- count number of changed lines and files
- add combined compare button into the old per changeset compare
- fixed some logic for remote & bundle compare system
- added few tests for git compare

Enabled compare engine for tags
Implemented compare engine for git repositories

new patch function, and urls schema.
now rhodecode generates
- diff
- plain diff
- patch files

both for git and hg

Implemented generation of changesets based
on whole diff instead of per file diff. That
can give a big speed improvement for large changesets in
repositories with large history.
- improved handling of binary files
- show renames of binary files
- implemented new diff limit functionality
- unify diff generation between hg and git
- Added binary indicators for changed files,
- added diff lib tests

fixes #612 Double quotes to Single quotes result in 4; to 9; in a visual Diff. Markupsafe.escape method usage
was causing some unpredictable behavior

#590 Add GET flag that controls the way the diff are generated, for pull requests we want to use non-bundle based diffs,
That are far better for doing code reviews. The /compare url still uses bundle compare for full comparision including the incoming changesets.
- Fixed tests

fixes #567 diff non-unicode encoding missmatch
- now uses safe_unicode ass all other parts of the system

fixes #550 mercurial repositories comparision failed when origin repo had
additional not-common changesets + added regresion test for this

Bumped mercurial version to 2.3
- fixed issues with compare of two remote repos at particular revisions
- added tests for cases when mercurial update broke code and tests didn't catch this
- removed obsolete EmptyChangeset from the rhodecode code

fixed issue #492 missing `\ No newline at end of file` test at the end of new chunk
in html diff

Improved RSS/ATOM feeds
- rewrote using new diff lib
- added shorter commit as title and full commit message in body
- increased feed size from 10 to 20 entries

Improved cross repos diffs
- added logging
- fixed branch issues and empty bundle case

added basic comparision of two repositories using bundles
and hg incomming

fixed vcs issue with last_changeset for filenodes
- fixed incosistency for displaying revision in file browser
- fixed raw_diff for git for single file mode
- file block now uses associated changeset for both git&hg

implements #308 rewrote diffs to enable displaying full diff on each file
- fixed escaping of html special chars in file editor

code garden for changeset ranges and comments
- disabled (for now) comments on changeset ranges
- code reuse by mako namespaces
- added flag for enabling comments in diffs

- diff.css merge to main style.css
- css fixes for diffs
- JS fixes for diff and inline comments

moved soon-to-be-deleted code from vcs to rhodecode
- diff lib
- annotate highlighter