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.

pull requests: fix issue when close button was inactive even if status
was approved or rejected already.

pullrequest: use simple link for 'Change style'

This seems to be more obvious and not require any explanation.

The checkbox is kept but made invisible - just to avoid controller changes.

remove comments associated to pull request from single changesets, it's too confusing.
Left are only ones that are status change so we can indicate where the status of this changeset came from

Implemented #670 Implementation of Roles in Pull Request
- only owner, reviewer or admin can change status or close pull request

small anchor cleanup
- fixed readme positioning with fixed bar
- added anchor link to inline comment

Forbid changing changset status when it is associated with a closed pull request
- fixed some issues with cascade deleting repos with changeset statuses attached

Added h.tooltip to all places that tooltip_title is used.
- improved escaping of < and > inside tooltips

Autocomplete fixes
- use translation MAP
- move translation to top level in order to be used inside rhodecode.js
- re-use user and groups data in changesets page

Added mentions autocomplete into main comments form
- recompiled yui.2.9.js using google compiler

Show changes of status inside comments
- comments that change status are now associated with status object, and showed in comments blocks

#415: Adding comment to changeset causes reload
- comments are now added via ajax and doesn't reload the page

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

#71 code-review
- simple inline comments

#71 code review
- added delete of comments by owner or admin

#77 code review
- initial very simple version of changeset comments
- RST parsed