Detect and warn about alien 'git' packages (-:  (cf ticket:135)
Detect and warn about alien 'git' packages (-:  (cf ticket:135)

babsey/sumatra,dpad/sumatra,open-research/sumatra,dpad/sumatra,dpad/sumatra,maxalbert/sumatra,open-research/sumatra,apdavison/sumatra,open-research/sumatra,maxalbert/sumatra,apdavison/sumatra,apdavison/sumatra,babsey/sumatra,maxalbert/sumatra,apdavison/sumatra,open-research/sumatra,babsey/sumatra,apdavison/sumatra,maxalbert/sumatra,babsey/sumatra,open-research/sumatra,babsey/sumatra,dpad/sumatra,maxalbert/sumatra,dpad/sumatra