This is the TODO list for the python rewrite

build from string
build from file
build from http
dont allow abspaths
check urls
urls we want:
relative - require base url set.
file:// - autodetect ?
urls to non arch paths.
arch:// - use pybaz ?
add ConfigSource type
implement a build
implement a front end
ConfigEntry eq with bad types, or with different values
add svn, cvs, tarball support back in.
