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   	InitBitMap -- Initialize bit map structure with input values.

	InitBitMap( bm, depth, width, height )
		    a0   d0     d1      d2

	void InitBitMap( struct BitMap *, BYTE, UWORD, UWORD );

	Initialize various elements in the BitMap structure to
	correctly reflect depth, width, and height.
	Must be used before use of BitMap in other graphics calls.
	The Planes[8] are not initialized and need to be set up
	by the caller.  The Planes table was put at the end of the
	structure so that it may be truncated to conserve space,
	as well as extended. All routines that use BitMap should
	only depend on existence of depth number of bitplanes.
	The Flagsh and pad fields are reserved for future use and
	should not be used by application programs.

	bm - pointer to a BitMap structure (gfx.h)
	depth - number of bitplanes that this bitmap will have
	width - number of bits (columns) wide for this BitMap
	height- number of bits (rows) tall for this BitMap



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