* make layout option to be treated in a single place and abstract it
  away for all the commands that take it into account
* svn-upgrade should update the origUrl property or field if found
  it simply needs to replace the trailing part of the URL, assume
  the tarball will/is uploaded in the same directory and print a
  message about that
* Migrate SDCommon into a typical perl module with POD content
  instead of just comments.
* we have some unchcked error codes, we might want to use autodie (Ryan52)
