* pdp11-opc.c: Fix "mark" operand type. Fix operand types

	* pdp11-opc.c: Fix "mark" operand type.  Fix operand types
	for float opcodes that take float operands.  Add alternate
	names (xxxD vs. xxxF) for float opcodes.
	* pdp11-dis.c (print_operand): Clean up formatting for mode 67.
	(print_foperand): New function to handle float opcode operands.
	(print_insn_pdp11): Use print_foperand to disassemble float ops.