ENH: Adding three new layouts

Slice view only configurations added: 4x3, 4x2, 5x2.

See #2384

From: Andrey Fedorov <fedorov@bwh.harvard.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22385 3bd1e089-480b-0410-8dfb-8563597acbee