Help for ISISLAB

PURPOSE:

 ISISLAB prints the PDS label and history objects of an ISIS cube to
 the terminal or Vicar log file.

EXECUTION:

  ISISLAB input-file-name OPTION

 where OPTION determines whether the LABEL object, the HISTORY object,
 or both, are printed.

Cognizant programmer: L.W.Kamp
Original Version:  26-Feb-1992
Revisions:
  1995-09-20 lwk - ported to Alpha
  1996-06-25 lwk - don't make 2-D Histo object required, so it can read any
		   ISIS label, not just NIMS cubes
  1996-11-03 lwk - allow tabs as separators (so can read EDR labels)
  1998-09-29 lwk - recognize DATA_TABLE for EDRs
  1999-01-25 lwk - made portable to Unix:  fixed some function arguments &
		   initializations, removed ZIA, added size to zvopen
  2000-09-01 lwk - cleaned up code for non-NIMS-cube cases
  2005-11-02 lwk - removed references to specific objects (except for HISTORY)
  2017-08-08 wlb - removed DEBUG from imake
  2019-09-05 wlb - IDS-7922 - Declared some variables; cleaned up -Wall warnings

PARAMETERS: