Add theme "quiet-purple" ported/adapted from metacity.

configure

configure.in

themes/Makefile.am

themes/Makefile.in

themes/exocet/close-pressed.xpm

themes/exocet/hide-pressed.xpm

themes/exocet/maximize-pressed.xpm

themes/exocet/menu-pressed.xpm

themes/exocet/shade-pressed.xpm

themes/exocet/stick-pressed.xpm

themes/quiet-purple/Makefile.am

themes/quiet-purple/Makefile.in

themes/quiet-purple/README

themes/quiet-purple/bottom-active.xpm

themes/quiet-purple/bottom-inactive.xpm

themes/quiet-purple/bottom-left-active.xpm

themes/quiet-purple/bottom-left-inactive.xpm

themes/quiet-purple/bottom-right-active.xpm

themes/quiet-purple/bottom-right-inactive.xpm

themes/quiet-purple/close-active.xpm