KT: pass screen number to the pager widget.
KT: take desktop geometry into account in pager.
KT: option for controlling pager visibility.
KT: provide info about whether window is on current desktop.
KT: add an option to only show windows from the current desktop.
KT: have room for pager button if it's shown.
Merge branch 'master' of github.com:0xd34df00d/leechcraft