Function:     irds_basic

Purpose:      irds_basic.c contains all basic irds access routines

Category:     IRDS

File:         irds_basic.c

Author:       P.R. Roelfsema

Description:    This file contains the basic IRDS routines for creating,
              deleting etc. of IRDSs. The following routines are available:

              IRDS_CLOSE        - close an IRDS.
              IRDS_EXIST        - test whether an IRDS exists.
              IRDS_DELETE       - delete an IRDS.
              IRDS_CREATE       - create an empty IRDS.
              IRDS_ENQUIRE      - gives info about an IRDS.
              IRDS_ENQUIRE_SNIP - gives info about a snip in an IRDS.
              IRDS_EXTEND       - extend IRDS with one snip.

Updates:      Aug 8, 1990: PRR, Creation date
              Nov 4, 1990: PRR, Changed SATCAL   -> TICK axis
                                        DETECTOR -> SDET axis
	      Feb 19,1992: DK, make status/error output parameter only
	      Mar 18,1992: FL, interface to IRDS_ENQUIRE_SNIP and
	                       IRDS_EXTEND changed. 
	      Apr 20, 1994:DK, Adjust hash table in irds_create to expected size