Fixed ordering of wedges in Ensight readers.

The Ensight format and the VTK ordering for wedges (penta6 and penta15)
is different. No one noticed it until now. Fixed.

Change-Id: Ie72b2ef43eea461be4b035d3d463b92a5a1ea720
Merge topic 'ensight-wedge-fix' into master

ac30d11b Fixed ordering of wedges in Ensight readers.