as it now works again after ancient emf import bug is fixed by

commit 5e5b90c1
Date:   Thu Feb 26 13:47:58 2015 +0000
    in BITFIELDS mode (3) there are *3* pal entries not 12

and two writer qa tests adapted to test for the actual pixel color vs the
underlying pixel data

This reverts commit 3c4f7704.

Change-Id: Id94f98f9c620c90fda097fa97fc34c9ee957c483