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.

improved title consistency
- changed - into dots to save space

various fixes for git and mercurial with InMemoryCommit backend and non-ascii files
- hg use tolocal for unicode objects
- git use core.quotepath=false for commands

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

new files views
- compated space
- nicer gui
- code garden

cleaned up JS files in files templates.
- fixed some small issues with editing/adding git files using codemirror
- small css fixes
- separated files/dir browsing into separate template