Loads the spectral descriptors from the file FName. The variable parameter SpdcCount returns the number of loaded descriptors. The function returns the following error codes:
0 .... everything OK, descriptors are loaded into the descriptor set
-1 .... invalid/unknown SPDC format
-3 .... no descriptors loaded, due to wrong file which does not contain descriptors
-4 .... no descriptors loaded, file is empty
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