[MERGE] make 'push' default to parent branch

[Stephen J. Turnbull]

Robert Collins writes:

 > But I really do think that folk that encounter a VCS for the *first
 > time* on their *own new project* are a pretty small subset of
 > users.

Could be, but I know I encountered both RCS and CVS because I needed a
tool for my own projects, which were getting out of hand (dot-files in
my home directory for RCS and then I graduated to CVS for a shared
project).