	*  Fixed several bugs with sprite emulation.  Several games(such
	   as "Trojan" and "VS Duck Hunt") that were broken in .71 and .72 now 
	   work ok.
	*  Added support for iNES mapper 82.  Thanks to those who work on
	   "unofficial nester".
	*  Added support for iNES mapper 250(used by "Time Diver Avenger").
	*  Fixed the documentation to show that iNES mappers 48, 83, and 232
	   are supported.
	*  Removed various pieces of stale code and fixed a few minor bugs.
	*  Fixed a triangle wave channel bug(the channel was sometimes enabled
	   when it shouldn't have been).
	*  Writing to $4010 with the upper bit clear now acknowledges the DPCM
	   IRQ.  This appears to fix "Stunt Buggies".
	*  Rewrote pieces of the Zapper emulation code to be cleaner and more
	   accurate.
	*  Rewrote the VS Unisystem dip switch drawing code.
	*  Simplified the setting of VS Unisystem dip switches.  The "V" key 
	   now toggles viewing AND editing of dip switches.
