Implemented one of the most often requested features for Dolphin: allow that the...

Implemented one of the most often requested features for Dolphin: allow that the command 'Delete' is shown in the context menu to bypass the trash. Like in Konqueror the default setting is that the 'Delete' command is not shown. TODO: currently this is a custom setting of Dolphin. Konqueror uses the global settings from KDE for this -> should this be changed to use the global setting instead?

svn path=/trunk/KDE/kdebase/apps/; revision=637232