Re-add brushedGnome skin that did not worked due to a typo and bump PKGREVISION.

While here restructure do-install target in order to avoid bzcat and gtar and
directly use pax to copy the skins.
This made the skins patchable and avoid to re-extract skin distfiles during the
install phase (at the price of a regular expression that should not be too
incomprensible).

ok martin@

(leot)