gitk: Add option to specify the default commit on command line
gitk: Add option to specify the default commit on command line

Other GUI tools may need to start gitk and make it automatically
select a certain commit.  This adds a new command-line option
--select-commit=id to make that possible.

Signed-off-by: Alexander Gavrilov <75c96f70141fec65a655d202cd4821a09cb99fd1@gmail.com>
Signed-off-by: Paul Mackerras <19a0ba370c443ba08d20b5061586430ab449ee8c@samba.org>

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