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FPIC_DEL()
   Deletes a picture from the picture file.

   Syntax
         nIndex = FPIC_DEL(nIndex,nPICHandle)

   Arguments
         nIndex      Sets the index position.
         nPICHandle  Handle for the PIC file.

   Returns
         nIndex      Returns a -1 if the function was unsuccessful.

   Description
         FPIC_DEL() deletes a picture from the picture file. When an image is
         deleted it is only removed from the index file. To completely remove
         the image the file must be packed with the FPIC_PACK() function.
         Another image of the same size or smaller can be placed in the same
         location in the file. However, if a larger image is saved then it is
         placed at the end of the file and the previously saved information is
         also still in the file. In this case the picture file must be packed
         to reduce the size of the file.