Fix pavement script to properly merge jQueryUI CSS.
Fix pavement script to properly merge jQueryUI CSS.

Avoids a duplication, fixes proper order and do not overwrite ui.all
file.

SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange