Adds scratchpadSpawnActionCustom where user specifies how to set
resource to "scratchpad". This allows use of gnome-terminal, etc.
Add detail to RationalRectangle documentation; strip trailing spaces.
Originally the key binding just spawned a new floating terminal on every keypress.
Now it spawns if it doesn't exist, summons from another workspace if it does but
isn't visible, or banishes it to a dynamically created workspace if it is on the
current workspace.
Key binding and ManageHook to pop up a small, floating terminal window for a few quick commands.
Combined with a utility like detach[1], makes a great X application launcher.
Requires my two new ManageHooks (doRectFloat, specifically).
[1] http://detach.sourceforge.net
