Better support for Rebase and Cherry-Pick with selected ranges.

[lolgear]

I would like to implement following feature:

As soon as we have rebase ( and it is far from good and nice feature even in git ), I would like to implement Rebase via Cherry-Pick and Selected Ranges.

1. Person select range of commits.
2. Person click "Rebase onto current branch via Cherry-Pick" or "Cherry-Pick all commits onto current branch"
3. Cherry-Pick performs.
4. Person CAN CHECK that commits from BOTH ranges are equal by their content or their messages. ( Better content, of course ).

Moreover, last step could be done also as Set Comparison, not Array comparison if person somehow mixed commits up.

So, we need following implementation:

1. Select range of commits ( via Shift ).
2. Check if we have one or two continuous ranges.
3. One continuous range has commands as "Cherry-Pick onto current branch".
4. Two continuous ranges have commands as "Check commits in ranges".