Added a rollback command for debugging. It sets back the heads of the p4 branches to the specified p4 change number or earlier.
Added a rollback command for debugging. It sets back the heads of the p4 branches to the specified p4 change number or earlier.

Signed-off-by: Simon Hausmann <557de780ea7e35794f4cd12cd1c79efe52f1d714@trolltech.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git