old style: make settings box expand to contain floating content and show menu nicely

The floating of the panes is hardcoded, so we also hardcode the necessary overflow auto.

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.

Added extra flag to invalidate caches when doing rescan from web
interface

Added flag to controll option for changing the repos path location
from web interface

Implements #842 RhodeCode version disclosure.

- it's now implemented as visual option in settings

improved title consistency
- changed - into dots to save space

repository extra fields implementation
- verion bump to 1.6
- migrations

Implemented basic locking functionality.

- Reimplemented how githooks behave
- emaulate pre-receive hook
- install missing git hooks if they aren't already in repo

Added form for controlling mercurial extensions
added hggit also for future

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

Implementes #509 require SSL flag now works for both git and mercurial.
- check is done at earlies possible stage
- if detected protocol is not https and flag require is there RhodeCode will
return HTTP Error 406: Not Acceptable, before even checking credentials
- removed push_ssl flag from mercurial UI objects since that would duplicate logic

sqlalchemy sessions cleanup in admin
Cleanup settings options

reimplemented tooltip, refactored tooltip_title into title for proper html,
and changed display strategy to right to temporary fix display problem with large tooltips

added option to enable/disable of logger hooks from admin panel.
some docs/setup updates