Add Moheli's theme data.

themes/moheli/Makefile.am

themes/moheli/README

themes/moheli/bottom-active.png

themes/moheli/bottom-active.xpm

themes/moheli/bottom-inactive.png

themes/moheli/bottom-inactive.xpm

themes/moheli/bottom-left-active.png

themes/moheli/bottom-left-active.xpm

themes/moheli/bottom-left-inactive.png

themes/moheli/bottom-left-inactive.xpm

themes/moheli/bottom-right-active.png

themes/moheli/bottom-right-active.xpm

themes/moheli/bottom-right-inactive.png

themes/moheli/bottom-right-inactive.xpm

themes/moheli/close-active.png

themes/moheli/close-active.xpm

themes/moheli/close-inactive.png

themes/moheli/close-inactive.xpm

themes/moheli/close-pressed.png

themes/moheli/close-pressed.xpm