NAME:
	readtil
 PURPOSE: (one line)
	Read and return the two images in a MaxEnt tile map file.
 DESCRIPTION:
 CATEGORY:
       Miscellaneous
 CALLING SEQUENCE:
	readtil,filename,pluto,charon
 INPUTS:
	filename - String containing the filename to be read from disk.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD PARAMETERS:
 OUTPUTS:
	pluto  - The first map found in the file (Pluto) (1-d vector).
	charon - The second map found in the file (Charon) (1-d vector).
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
	Written by Marc W. Buie, Lowell Observatory, 1991 Sep 27.