Get rid of some more embedded XPMs in UI files.

In this case, (the button icons in the data manager) I have not added them back in
with kiconloader because
-I don't really like icons on buttons
-Several of the icons were really tacky in 22x22 mode, though
shrunk to 16x16 for the menues, they look semi-ok.

If anyone has strong feelings that we should keep the icons on the
buttons in the data manager, we can discuss kiconloading them.
Otherwise, they are gone.