Rework the local subscription dialog to look similar to the one used in

the IMAP resource. Makes it simpler to handle and to fit on small screen
(again like the IMAP resource there's a list view only mode for the
mobile case).

BUG: 249035
BUG: 250717
BUG: 250718

svn path=/trunk/KDE/kdepimlibs/; revision=1178624