Set classification word written to event directory

Input argument:

IBIT

Turn on bit IBIT in classification word. IBIT = 1 - 30.

QWCLAS has to be called once for each bit which is to be set; i.e., if three bits are to be set, QCLASW has to be called three times. Note that a call to QWCLAS simply turns on a single bit while leaving other bits unchanged. The intial classification word is the one read from the input file; therefore, the classification word must be zeroed before storing your own values:

       CALL QWCLAS(0).

If QWCLAS is not called, the classification word will be set equal to that on the input file.