Added test contributed by Jeff Whitaker.
Merge remote-tracking branch 'upstream/master'
Correct order of unlimited dim checking in test.  (Was relying on old behavior
of backwards ordering)
Switch test for nc_inq_unlimdim and nc_inq_unlimdims to use the same ordering as
the rest of the dimension queries.  Correct error in library where types used
in sub-group variables but that were added to the file after the sub-group was
created weren't available for sub-group variables to use.  Start cleaning up
test suite and un-commenting tests that were commented out (got up to
nc_test4/tst_fills2.c, alphabetically) before running into an error in HDF5.