Added Tenuto, Marcato, and Saboteur in abilities.sql.

Created scripts for Saboteur, Tenuto, and Gravity II.
(Haven't added checks for Tenuto yet to bard spells.)

Modified enfeebling spells for RDM to check for Saboteur effect.
(Have tested all of them with and without Saboteur.)
Saboteur doubles the duration and effect for enfeebling spells only.
Source: http://wiki.bluegartr.com/bg/Saboteur