update german translation
Rename tab-add-to-group to tab-window-add-to-tabgroup and
tabgroup-add-to-group to tab-tabgroup-add-to-tabgroup
in tabs/tab.jl and wm/keymaps.jl.
You must update your keybindings for title and tabbar.

Add/improve text/doc strings in tabs/tab.jl and tabs/tabgroup.jl

Add defcustom marked-cursor-shape to commands/move-resize.jl
Use custom cursor if window marked to add as tab.

Improve text/doc strings in prg/compton.jl

Add missing text/doc strings in sawfish.
Update StyleTab/theme.jl text strings
The problem is that any sticky windows that have been focused once
will _always_ rise to the top of the order when switching viewports
(since the topmost window is _always_ focused when entering a new
workspace). The hacky solution is to record the input-focus window
if leave a workspace and restore if reenter the workspace.

(if that window is destroyed the root window will be focussed)
update my mail address
update ChangeLog
update german translation
add ability to move tabs around
improve icon sizes in StyleTab
improve speed and memory usage of StyleTab
update man/news.texi
use menulibre instead of alacarte for XFCE and MATE
don't let xfce-session save the session
speed up StyleTab and add Flat style
Merge remote-tracking branch 'origin/master'