* LICENSE=gnu-lgpl-v2.1
* pure python package, c complier is not required.
* no need to buildlink with py-numpy, simple DEPENDS is sufficient.
* drop patch-aa from distinfo, it does not exist.
Bump PKGREVISION.
Inspired by FreeBSD "ports".
Fix the PLISTs accordingly.
Also, while at it, remove now obsolete compileall.py calls in post-install
targets and insure that extension.mk is in included before builinlinks of
other Python modules.
Discussed with/ok'ed by drochner@.