Don't allow to rename a read only folder (bug found on my kdab account)
Don't allow to rename a read only folder (bug found on my kdab account)

svn path=/branches/KDE/4.4/kdepim/; revision=1090108

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi