Fix memory problems in flatten test

[BradWhitlock]

I ran the Conduit tests after having built with the Intel compiler and the flatten test failed again in a new way. I ran through valgrind and it found out of bounds reads for the braid _quads_andtris dataset. When I printed out that dataset, which gets used in flatten to make a 4x3 node mesh, it had some node ids that were larger than 11. The routine that made the connectivity was bad.

• I fixed the problem connectivity and now valgrind shows no errors in the flatten test
• I had to update a few partition baselines due to the connectivity changes
• I fixed some warnings

[BradWhitlock]

Wait a minute. I forgot to re-enable a test that started misbehaving.