Converted pivot table layout dlg to .ui

pimped up dialog a bit, added mnemonics

Change-Id: I4585d9a3a1c96b45c7eedea8a5be41ec717139dd
fix homogeneous grid spanning row/col handling

Change-Id: I26ca29f2b02a1587cfe94d5342809f51a207a194
Various adjustments of the pivot table

especially relative positions were relative
to the dialog which was assumed to be then
a direct parent of the widgets so that
a simple calculation could make the positions
relative to the widgets

also now the pivot table fits into a 768 pixel high
screen

Change-Id: I86a4155439872e8273943b90f15320e560e237a4