Added feature for the mcdiff for the bidirectional merge.
With F15 mcdiffviewer merge left panel to right panel direction.
original patch by Gergely Szasz <szaszg@hu.inter.net>
Signed-off-by: Ilia Maslakov <il.smind@gmail.com>
added bind "MergeOther" into mc.keymap.default, mc.keymap.emacs.
Signed-off-by: Ilia Maslakov <il.smind@gmail.com>