1. rename portname to name (externally) and portversion to version (l…

…ikewise)

2. add platforms lines to everything based on current buildability testing
   on darwin and freebsd.

git-svn-id: https://svn.macports.org/repository/macports/trunk/base@960 d073be05-634f-4543-b044-5fe20cf6d1d6