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.

Unified the paginators for pylons and YUI.
- YUI based paginators now behave more like the ones generated with pylons
- introduced new custom pylons paginator for customizations needed to unify both

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'.

Implemented #738 Giving a user WRITE+ permissions on folder should not allow repo creation in root folder.
user can create repos only if he got explicitly permission for creating repos globally, or have WRITE+ permission on a group.
Then he can create repositories inside this group

don't show rss links - atom is the present and the future

- following the reasoning on http://selenic.com/pipermail/mercurial-devel/2012-December/046542.html

hide add repository button when you don't have at least write permission in group
ref #730

Group management delegation:
this allows users to become an admin of groups
a group admin can manage a group, change it's name
or permissions. A group admin can create child group
only within a group he is an admin off.

Top-level group can be only created by super admins

html: don't hardcode uppercase texts

_If_ we want uppercase then it should be done in css.

Use common function for generation of grid data
- admin grid now has dedicated edit button, and uses changeset_cache
- some small improvements to grid
- all other datatables use this

Update last_change from VCS data on request.
- lightweight dashboard shows now last_date also taken from db and it is fast !

Reimplemented file-browser using partial-ajax
- improves the speed of browsing of files for revision
- url push state via html5 History
- also cache the results of calls for even faster handling the content

merged + fixed pull request #62: Implemented metatags and visualisation options.
- new tag lang
- fixed found issues
- added simple test

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

#227 Initial version of repository groups permissions system
- implemented none/read/write/admin permissions for groups
- wrote more tests for permissions, and new permissions groups
- a lot of code garden, splitted logic into proper models
- permissions on groups doesn't propagate yet to repositories
- deprecated some methods on api for managing permissions on
repositories for users, and users groups

Added sorting into journal and admin pages
- code garden to reuse some blocks and make it consistent on different views

fixes #229 repo sorting is not working.
- implemented repo sorting using YUI dataTable

Implements #304
hashes in relevant places are displayed using monospaced font.

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

implements #226 repo groups available by path
fixes #259 Groups with the same name but with different parent group

Fixed show more links.
improved gui for quick menu.