Removed unused USE flag descriptions; converted leading spaces to a tab.

Package-Manager: portage-HEAD
Manifest-Sign-Key: 6D34E57D
Added missing metadata.xml, removed trailing whitespace; dropped keywords ~alpha, ~ia64, ~ppc, ~ppc64 and ~sparc, tracked in issue #79.

Package-Manager: portage-HEAD
Manifest-Sign-Key: 6D34E57D