cafeaddextrakey

           Used to add for _EXTRA structure a keyword entry and set
           it at a given value.

           cafe

           parameter propagation

           pro,foo,..._EXTRA=extra
           ...
           ex1 = cafeaddextrakey(extra,key,value)

           extra - _EXTRA structure.
           key   - string containing keyword to add.
           value - value to set the keyword with.

           Returns: New _extra structure

           None. (Auxiliary routine only).

           $Id: cafeaddextrakey.pro,v 1.3 2005/01/04 14:04:53 goehler Exp $
 $Log: cafeaddextrakey.pro,v $
 Revision 1.3  2005/01/04 14:04:53  goehler
 fix: proper header
 Revision 1.2  2003/11/04 16:34:01  goehler
 fix: look for folded case when adding new key...
 Revision 1.1  2003/06/16 08:55:16  goehler
 added major task: information about currently used plot type is written
                   into the plot.legendinfo environment structure list.
                   This information is used by the legend type "data" which
                   displays information about the different plotted lines.
 Also added: _EXTRA setting of PSYM entry with cafeaddextrakey function,
             new plot when legend will change
             add/remove facility for legends
             legend show type

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