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.

branch selectors: show closed branches too

It would be even better if they were fetched dynamically somehow and perhaps
placed in a sub sub menu ... but showing them in the list is often better than
not showing them at all.

vcs: fixed issues with calling get_changesets method doesn't
throws EmptyRepositoryError when called on empty repos

synced vcs with upstream

- moved subprocessio module to VCS
- many small changes to make embedded vcs as similar to to external lib
- use only absolute imports
- patch vcs config during load pylons env

changelog pagination with branch filtering now uses
common logic that non branch filtered version.
- introduced CollectionGenerator object as a helper for
achieving abstraction layer on top of filtered results

get_changeset uses now mercurial revrange to filter out branches.
it's around 20% faster this way

avoid %r markup of unicode strings in user facing messages

Improves
Revision u'b7f4...' does not exist for this repository

avoid displaying repr of internal classes in user facing messages

The context of the message will tell where the problem was and there is no reason to show
... does not exist for this repository <MercurialRepository at /home/marcink/repos/rhodecode>

changelog: make it possible to use closed branches in ?branch=...

Closed branches in Mercurial are just not announced. It should still be
possible to use them. (And arguably there should also be a way to explore them
in the UI.)

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

Fixed validators for remote repos
- use proper httppeer repo for mercurial 2.3
- validate git repos for remote auth
- docs updates

allow cloning with hgsubversion (reimplementing pull request 46)

sadly I get a exception from hg-git when doing the same for git+http URLs
so I did not implement it for hg-git