Make NewPicsDialog usable by keyboard

Fix focus policy: only change focus between MappingTreeWidget and
MappingTreeResultView.

Also, block updating the selection of MappingTreeWidget when removing an
item from the result view. That operation resets the result selection
and by signal changes the selection of the mapping tree. The easiest way
I could come up with was a member flag that is set in removeMapping and
checked and cleared in resultSelectionChanged. Clearing the flag right
after removing the item doesn't work, most likely because of thread
affinity (just a guess, didn't check it). If it has side effects remains to
be seen...

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