Mask pixel plots should interpret bit flags

The masked pixel plots provided in PIPE1D-63 from the 1D-team show just the raw mask values, with no interpretation of the individual flags. Please provide such plots based on the flag values rather than the raw values.

See https://github.com/Subaru-PFS/datamodel/blob/54a6a847a76ab8401f71e2aca6db665648e1aaca/datamodel.txt#L690-L714 for an explanation of the bit mask values. The flag property of the pfsObject also has this information:

In [42]: obj.flags
Out[42]: MaskHelper({'BAD': 0, 'BAD_FIBERTRACE': 11, 'BAD_FLAT': 9, 'BAD_FLUXCAL': 13, 'BAD_SKY': 12, 'CR': 3, 'DETECTED': 5, 'DETECTED_NEGATIVE': 6, 'EDGE': 4, 'FIBERTRACE': 10, 'I
NTRP': 2, 'NO_DATA': 8, 'SAT': 1, 'SUSPECT': 7, 'UNMASKEDNAN': 14, 'OVERLAP': 15})

In [45]: obj.flags.interpret(128)
Out[45]: ['SUSPECT']

There are additional 2DDRP utilities to help interpret the mask values.