Reduce restrictions from RESTRICTED to NO_CDROM -- the licensing
allows use by academic community as long as it is not redistributed.
Upstream still do not version their "releases", so next time they
reroll the tarball, the download will start breaking again. But
this time, it will be possible to fetch it from FreeBSD mirrors.
Hide most of the optional data files under the DOCS-option and
streamline various build-related scriptlets.
05b84dd275