Combine nested if statements.

git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@5412 be7e6eca-30d4-0310-a8e5-ac0d63af7087
Remove Subversionisms from the cvs2git generated man page.

Clean up several small cvs2svn-specific reference fossils that were
appearing in the manpages of cvs2git etc.  Left untouched is the big
one, the "SUBVERSION PROPERTIES" section; that will require another
patch.

Original patch by: Eric S. Raymond <esr@thyrsus.com>
Patch split up by me.

git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@5413 be7e6eca-30d4-0310-a8e5-ac0d63af7087
Make the --username option unnecessary for the DVCS outputs.

The DVCSs need a username for synthesized commits, so set a default
rather than making it mandatory for the user to select one.  As
default, use the name of the conversion tool ("cvs2git", "cvs2bzr", or
"cvs2hg").

Leave the value unset by default for cvs2svn, because Subversion
allows commits without an explicit author.

Suggested by: Eric S. Raymond <esr@thyrsus.com>

git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@5414 be7e6eca-30d4-0310-a8e5-ac0d63af7087