Address keywords missing from datamodels

[braingram]

At the moment these are:
HDU: CENTROID KEYWORD: GUIDESTA #340
HDU: PRIMARY KEYWORD: CALIB #342
HDU: PRIMARY KEYWORD: MSACFG10 #349
HDU: PRIMARY KEYWORD: MSACFG36 #349
HDU: PRIMARY KEYWORD: NEXTEND #345
HDU: PRIMARY KEYWORD: PA #342
HDU: PRIMARY KEYWORD: PPSDBVER #350
HDU: PRIMARY KEYWORD: R_DRZPAR removed in #316
HDU: PRIMARY KEYWORD: TEXPTIME removed in #277
HDU: REFSTAR KEYWORD: NUMREFST #341
HDU: SCI KEYWORD: SLIT_DEC #343
HDU: SCI KEYWORD: SLIT_RA #343

all of the remaining (I think) are captured by #344
HDU: TARG_ACQ KEYWORD: BCKGMETH
HDU: TARG_ACQ KEYWORD: BCKGVALU
HDU: TARG_ACQ KEYWORD: BOXPKCOL
HDU: TARG_ACQ KEYWORD: BOXPKROW
HDU: TARG_ACQ KEYWORD: BOXPKVAL
HDU: TARG_ACQ KEYWORD: BOXTOTVL
HDU: TARG_ACQ KEYWORD: CENBOXCL
HDU: TARG_ACQ KEYWORD: CENBOXRW
HDU: TARG_ACQ KEYWORD: CENITERS
HDU: TARG_ACQ KEYWORD: COLMOMT2
HDU: TARG_ACQ KEYWORD: COLMOMT3
HDU: TARG_ACQ KEYWORD: CONVSTAT
HDU: TARG_ACQ KEYWORD: CONVTHRS
HDU: TARG_ACQ KEYWORD: CORR_COL
HDU: TARG_ACQ KEYWORD: CORR_ROW
HDU: TARG_ACQ KEYWORD: CRMETHOD
HDU: TARG_ACQ KEYWORD: DTCENCOL
HDU: TARG_ACQ KEYWORD: DTCENROW
HDU: TARG_ACQ KEYWORD: EXTCOLST
HDU: TARG_ACQ KEYWORD: EXTROWST
HDU: TARG_ACQ KEYWORD: FINCOLDF
HDU: TARG_ACQ KEYWORD: FINROWDF
HDU: TARG_ACQ KEYWORD: GUIDERID
HDU: TARG_ACQ KEYWORD: IDEAL_X
HDU: TARG_ACQ KEYWORD: IDEAL_Y
HDU: TARG_ACQ KEYWORD: IMAGETYP
HDU: TARG_ACQ KEYWORD: IMCENCOL
HDU: TARG_ACQ KEYWORD: IMCENROW
HDU: TARG_ACQ KEYWORD: REFSTCAT
HDU: TARG_ACQ KEYWORD: REFSTDEC
HDU: TARG_ACQ KEYWORD: REFSTMAG
HDU: TARG_ACQ KEYWORD: REFSTNAM
HDU: TARG_ACQ KEYWORD: REFSTRA
HDU: TARG_ACQ KEYWORD: REF_STAR
HDU: TARG_ACQ KEYWORD: ROWMOMT2
HDU: TARG_ACQ KEYWORD: ROWMOMT3
HDU: TARG_ACQ KEYWORD: SAM_V2
HDU: TARG_ACQ KEYWORD: SAM_V3
HDU: TARG_ACQ KEYWORD: SAM_X
HDU: TARG_ACQ KEYWORD: SAM_Y
HDU: TARG_ACQ KEYWORD: SCIXCNTR
HDU: TARG_ACQ KEYWORD: SCIYCNTR
HDU: TARG_ACQ KEYWORD: STAT_RSN
HDU: TARG_ACQ KEYWORD: TARGETV2
HDU: TARG_ACQ KEYWORD: TARGETV3
HDU: TARG_ACQ KEYWORD: TASTATUS
HDU: TARG_ACQ KEYWORD: TA_DTCTR
HDU: TARG_ACQ KEYWORD: V2_OFFST
HDU: TARG_ACQ KEYWORD: V2_PLAND
HDU: TARG_ACQ KEYWORD: V2_REF
HDU: TARG_ACQ KEYWORD: V3_OFFST
HDU: TARG_ACQ KEYWORD: V3_PLAND
HDU: TARG_ACQ KEYWORD: V3_REF
(as reported by the tool added in #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.