Compare modes

[kruegener]

• Compare against fork point
• Try merge into master and compare perf
• opt: compare against last common

[kruegener]

Last common ref (mostly last time master was merged into branch):

git merge-base MASTER-ref BRANCH-ref

[kruegener]

Fork Point of Branch (on origin/master):

git merge-base --fork-point origin/master BRANCH-ref

Only Finds fork points for non-deleted branches that have not been merged into master.