Log Message:
Convert the python packages to use the alternatives system to install a
bin/python wrapper.  Bump their PKGREVISION to 1.

Also remove the python package.  In order to preserve a similar behavior to
this one using the new framework, start by installing pkg_alternatives.
Then just open its manpage, scroll down to the EXAMPLES section, Applying
filters subsection, and follow the (rather short) directions given there.