Made repeating button use opacity IPF for transparent versions (value set to 65%).

Thanks to bumbadadabum for pointing out I had forgot to do this
New artwork for the item groups palette in the editor
Merge branch 'master' of https://github.com/wesnoth/wesnoth-old
Goto Micro AI: do not exclude leaders by default

The MAI accidentally excluded units with canrecruit=yes.  Thanks H-Hour.