---+ pipe_loaddata.m
This function takes the scan numbers given in szvar.scannum and loads the matching mbfits data stored in the directory defined by szvar.archivedir to create a szd structure using the szd_readscans function.
The flux and beam parameters calibration files stored in szvar.caldir are loaded into the szd structure and all flags are initialized to zero.
-- JamesKennedy - 24 Jul 2007