p4_dscm. Add version option.

Current version is 0.0.0
p4_dscm. Fixs to change command.

Comment out the push test to see if the source repo is up to date with the P4
git repo. This needed to be removed because it is not a reliable mechanism
for such a test. A better mechanism is needed.
Add merging the master branch to the change branch.
Fix an issue that caused a crash when calling the add a file to p4 change
list utility method. Adds the missing dscm diff call at the beginning of
the method.
p4_dscm. Remove old p4-git script