Remove 'nat' useflag as it is misleading and replace it with an

Remove 'nat' useflag as it is misleading and replace it with an
  appropriate 'nat-transport' flag and warn users about it. Fix dependency on
  openssl[-bindist] wrt bug #311981. Thanks to Thomas Klute for reporting this.
  Overhaul of package/useflag descriptions. Drop built_with_use again
  (deprecated) which I introduced in the latest revision. Addition of several
  new warnings/logs that will hopefully help the user. Drop old (and
  unsupported by proxy maintainer) ebuilds. Update metadata.xml.
Package-Manager: portage-2.2_rc67/cvs/Linux x86_64