adds screenshot commands
Adds gother and window-selection by s-#

gother is mapped to s-ESC for quick selection
of the last group.

The windows can be selected by s-#, i.e. s-1 for
window 1, s-2 for window 2, etc.

Also, a simple macro to concatenate strings is added.
Merge branch 'master' of github.com:Ralt/.dotfiles