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.

Don't use -p flag together with -s in git calls. Latest
git version changes behaviour of such call changing the output.

In all the calls where -p -s was used we're only interested in
list of changesets and not the diff.

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

removed assertion about ancestor revision.
log this as a warning, and let it proceed.
ref #829

auth decorators are not used anymore on __before__
- this will allow to create a whitelist of API enabled controller functions
- moved around functions with _ to beginning of the files to make it cleaner

compare: move get_changesets to compare controller where it is used

That is a better location than the pull request model. It should probably be
split up and moved to the backend specific Repository classes.

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.

move the existing changeset checks bellow other checks else it can throw exceptions for non
existing repos

compare/pullrequest: introduce merge parameter

This is more correct and flexible than the old way of looking on same/different
repo.

compare: cleanup of as_form handling

as_form is only used when loaded 'partial' from pullrequest.html. Including it
in the 'Detailed compare view' url did thus not do any harm.

as_form is never used in pullrequest_show.html or compare_diff.html and it is
thus never used together with swap_url ... which is why the wrong
'as_form=None' or 'as_form=False' in urls didn't do any harm.

fixed pull-requests with cherry picking changesets
- fixed tests for them

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: swap org and other when they refer to different repos, ie are pull request style

Pull requests will have a different from/to description - but in a consistent
and slightly better way that can be improved later.

A pull request diff is empathic: "How will this look for the peer I'm proposing to" style.

compare: rename optional compare_url parameter repo to other_repo

At the same time it is placed before other_ref_type and other_ref. Just to keep
a logical flow and (a new) consistency that will help the next refactoring.

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.

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

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

Optimized look of compare view of changesets.
Added cut off limit for compare view

Enabled compare engine for tags
Implemented compare engine for git repositories

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

#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

swap the select values with revisions dynamically when switching the repos on pull request view
- fix the partial ajax request that should never do redirect

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

Added basic models for saving open pull requests
- added pull-request models
- added pull-requests notifications into inbox

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

added basic comparision of two repositories using bundles
and hg incomming