Log Message:
gentoo: Update to 0.20.7

note: this now uses GTK3.

0.20.7
* Fixed bug that prevented setting the colors for a command button's
  secondary (right-click) function. Reported by RickTee.
* Tiny rewrite to how list entries are stored when reading directories
  which on my system improved speed by around 30X. Suggested by RickTee.
* Updated the GNU gettext machinery. Now requires gettext on your system
  to support internationalization, instead of including the code in a
  intl/ subdir in gentoo's code. Makes sense?
* Fixed a bug that made gentoo's progress-reporting dialogs lack a
  parent window, whch in turn made GTK+ emit warnings.