modified exmmtest.exe to display graphix

modified exmmtest.exe to display graphix
	modified:   16.exe
	modified:   exmmtest.exe
	modified:   fontgfx.exe
	modified:   fonttes0.exe
	modified:   maptest.exe
	modified:   miditest.exe
	modified:   palettec.exe
	modified:   pcxtest.exe
	modified:   src/exmmtest.c
	modified:   src/lib/16_mm.c
	modified:   src/lib/16_mm.h
	modified:   src/lib/modex16.c
	modified:   src/lib/modex16.h
	modified:   test.exe
	modified:   test2.exe