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Testing the graphical output

Due to the fact that different PostScript files can produce the same graphic output, regression testing could not be used. Testing the graphical files required the use of the rtesting.pl script. In rtesting.pl, the flag for the graphical output was changed for each of the scaling factors. Then by printing out a subset of the postscript files generated by running rtesting.pl, differences in each of the scaling factors could be visually checked. The output could also be sent to different printers to verify printing compatibility. These postscript files need not be checked into the RCS, so once verified, they can be removed from the test directory.