Get data about available versions from config file.
Allow to create archive with difference between 2 revisions

#1361
Allow to create archive with revision filter from Menu

#1361
Archive revision's checkbox shouldn't be checked if there is only one revision
rearranged layout
Uncheck Revision path checkbox or revision diff checkbox when checking the other one.

Hide diff commit summary control
Handle new descriptions of detached head introduced in git 1.8.3

see git gc8183cd builtin/branch.c

There are 4 types in total:
(no branch, rebasing %s)
(no branch, bisect started on %s)
(detached from %s)
(no branch)

Conflicts:
	GitUI/FormBrowse.cs
	GitUI/FormPull.cs
- Removed sort on selected revision

- Change commit summary to a small one
move user manual handling out of UI
move open in default browser functionality out of UI
Merge branch 'pr/n1918_mexx'
Corrected URIs
Removed compiler warnings.
DeleteUnusedBranchesForm: add Settings button to directly go to corresponding plugin settings page
DeleteUnusedBranchesForm: set minimum size for dialog
BackgroundFetchPlugin: if invoked via menu show SettingsDialog instead of doing nothing
rearrange layout
Added likn to wiki page
Fix #1660: replace GitEx with GitExt
replace gitex with gitext in LinkFactory