* core.c: Rename to corefile.c

	* core.c:  Rename to corefile.c
	* core.h:  Rename to corefile.h
	* inline.c: Include corefile.h, renamed from core.h.
	* cpu.h: Include corefile.h, renamed from core.h
	* vm.c: Include corefile.h, renamed from core.h
	* Makefile.in (CPU_H): Change core.h to corefile.h
	(vm.o):  Change dependency to corefile.h
	(LIB_SRC): Change core.c to corefile.c.
	(LIB_OBJ): Change core.o to corefile.o.
	(corefile.o):  Change dependencies to corefile.c, corefile.h.
	* corefile.c: Include corefile.h rather than core.h
	* README.psim (KNOWN PROBLEMS): Change core.* references to corefile.*
	references.