argparse was missing from this ports RUN_DEPENDS, causing errors on imports.
argparse is avaiilable in the Python 2.7 and 3.2+ standard libraries so patch
setup.py to only require it for those versions.
Patch has been committed upstream and won't be necessary for the next release.
While I'm here, enable STAGE support.
PR: ports/183477
Submitted by: koobs
Approved by: Volodymyr Kostyrko <c.kworr@gmail.com> (maintainer)
