* interp.c (MEM_SIZE): It's now bytes, not a power of 2.

	* interp.c (MEM_SIZE):  It's now bytes, not a power of 2.
	* (map):  Add support for external mem in the 1->2 meg range.
	Also, abort() when memory access is way out of bounds.  (Better to
	die than to give wrong result.  (This will be fixed later.))
	* (sim_size):  MEM_SIZE is now bytes, not shift factor.