TAB_COL

       Procedure to extract column information from table control block

       tab_col, tcb, column, offset, width, datatype, name, units, format

       tcb - table control block returned by tab_open.
       column - column name (string) or column number

       offset - column offset bytes
       width - column width in bytes
       datatype - column data type:
               6 - real*4
               7 - real*8
               4 - integer*4
               1 - boolean
               2 - character string
       name - column name
       units - column units
       format - format code

       If the column is not found then !err is set to -1.
       Otherwise !err is set to the column number (starting at one).

       version 1  D. Lindler  Jan 88
       Converted to NEW IDL  April 90
       Converted to IDL V5.0   W. Landsman   September 1997

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