Address keywords in datamodels but missing from the keyword dictionary

[braingram]

At the moment these are: HDU: COMBINE1D KEYWORD: SOURCEID HDU: COMBINE1D KEYWORD: SPORDER HDU: COMBINE1D KEYWORD: SRCTYPE HDU: EXTRACT1D KEYWORD: DISPAXIS HDU: EXTRACT1D KEYWORD: EXTRXSTP HDU: EXTRACT1D KEYWORD: EXTRXSTR HDU: EXTRACT1D KEYWORD: EXTRYSTP HDU: EXTRACT1D KEYWORD: EXTRYSTR HDU: EXTRACT1D KEYWORD: INT_NUM HDU: EXTRACT1D KEYWORD: MJD-AVG HDU: EXTRACT1D KEYWORD: MJD-BEG HDU: EXTRACT1D KEYWORD: MJD-END HDU: EXTRACT1D KEYWORD: SHUTSTA HDU: EXTRACT1D KEYWORD: SLITID HDU: EXTRACT1D KEYWORD: SOURCEID HDU: EXTRACT1D KEYWORD: SPORDER HDU: EXTRACT1D KEYWORD: SRCALIAS HDU: EXTRACT1D KEYWORD: SRCDEC HDU: EXTRACT1D KEYWORD: SRCNAME HDU: EXTRACT1D KEYWORD: SRCRA HDU: EXTRACT1D KEYWORD: SRCXPOS HDU: EXTRACT1D KEYWORD: SRCYPOS HDU: EXTRACT1D KEYWORD: STLARITY HDU: EXTRACT1D KEYWORD: TDB-BEG HDU: EXTRACT1D KEYWORD: TDB-END HDU: EXTRACT1D KEYWORD: TDB-MID HDU: EXTRACT1D KEYWORD: TIMESYS HDU: EXTRACT1D KEYWORD: TIMEUNIT HDU: FGS CENTROID PACKET KEYWORD: DETECTID https://github.com/spacetelescope/stdatamodels/issues/340 HDU: FGS CENTROID PACKET KEYWORD: GUIDESTA https://github.com/spacetelescope/stdatamodels/issues/340 HDU: FLIGHT REFERENCE STARS KEYWORD: NUMREFST https://github.com/spacetelescope/stdatamodels/issues/340 HDU: PRIMARY KEYWORD: DITH_DEC HDU: PRIMARY KEYWORD: DITH_RA HDU: PRIMARY KEYWORD: KERNXSZ HDU: PRIMARY KEYWORD: KERNYSZ HDU: PRIMARY KEYWORD: S_MIREMI HDU: PRIMARY KEYWORD: THRSPRC HDU: SCI KEYWORD: SMOOTH_L HDU: WCS-TABLE KEYWORD: TDIM2 (as reported by the tool added in https://github.com/spacetelescope/stdatamodels/pull/337 and against a modified keyword dictionary that fixes most of the oifits related differences).

This issue will be updated as the above are categorized.

These mostly look to be:

• extra extensions with names other than SCI (EXTRACT1D, COMBINE1D)

• 340

• keywords that likely make sense to add to the keyword dictionary