Add some checks for NULL segments, records, etc.
fixed a bug: disk center longitude should be zero also set outarr->israw to 0. doesn't seem to matter though
Xudongs chnages - addition of the requestid parameter, setting of False for the default values of the l and e flags, writing of the BUNIT_XXX keywords.
Add hmib2ptr for Xudongs processing of hmi.b_720s to an intermediate series from which patches will be made.
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