[Bug 31987] possibility to disable specific screensavers

[Rafał Próchniak]

Public bug reported:
https://launchpad.net/malone/bugs/31987

Affects: gnome-screensaver (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
(dapper, as of February 19)

Reasons:
1. OpenGL and other resource-devouring screensavers make certain machines suffer. (For example SiS does not support OpenGL while many computers use their onboard graphics). 

2. Some may confuse inexperienced users (i.e. BSOD).

3. Some screensavers are ugly, we don't want to include them in a random
pool, there is no way to uninstall them nicely.