Chagall Reference   Delete picture        12.5.93
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   With this function it is possible to delete
   the current picture contents, which may, if 
   the appropriate option is switched on, be 
   preceded by a Safety query..\..\OPTIONS\GLOBAL.
   Please note that this function -- depending
   on the mode -- deletes either the current  
   picture or the mask of the current picture.

   'Delete picture' leaves behind an empty 
   picture of the same size -- i.e. no memory
   is released.

