Unit test related fixes.

Nosetests was ignoring mi/dataset/parser/test/test_nutnr_b_dcl_conc.py, mi/dataset/parser/test/test_nutnr_b_dcl_full.py and mi/dataset/parser/test/test_velpt_ab.py due to the files being executable.  The executable permissions has been removed.  The mi/dataset/parser/test/test_nutnrb.py is old an OBE.  The mi/dataset/parser/test/LA101636.PD0 was set to be executable and eliminated that aspect.  Added a tweak to mi/dataset/parser/nutnr_b_dcl_parser_base.py to resolve an unexpected data issue.  Cleaned up YML files for nutnr_b/dcl_full and nutnr_b/dcl_conc which were not fixed in the precision and hour off fix about a month or so ago.