Our CVS repository path handling was pretty bad. We only injecting the

form's username and password if not specifying a repository type (such

as :pserver:). This led to a lot of confusion.
Now, our regex and CVSROOT building are a lot smarter. The user can

provide a :pserver: (or equivalent) CVSROOT, and either include or leave

out the username or password. Those will then be provided based on the

form input.
The workaround for using hostname:port/path format has been removed from

the docs, since it's far more natural to use a valid CVSROOT.

Tested some combinations by hand against a real CVS repository, and looked

at debug output for the generated CVSROOT.
Added new unit tests for the various combinations, which pass.