Enable all unit tests
Remove 'DISABLED' test
Delete failing dsl tests
Remove specific types from PixelsService methods

The addition of PixelsBuffer subclasses to the create
methods in PixelsService broke the mocked tests in romio.
This adds a sub-optimal workaround, but this code is
slated for refactoring and therefore this will hopefully
disappear in the mid-term.
Fix romio tests

The NPE is a trivial fix. The passing of false to the
getPixelBuffer method should be looked into. It seems
that the pyramid should be opened read-only, but that
doesn't look to be how things are set up.
Re-disable blitz
Revert "Remove specific types from PixelsService methods"

This reverts commit 566c4042a2978f30b9b08c52dfa5a2d4e04e2863.
Remove GetPixelBufferUnitTest

Without the interface changes from previous commits,
this test cannot possibly succeed (or even run).
Removing.
Merge pull request #3266 from joshmoore/more-unit-tests

More unit tests