* hppa-tdep.c (deposit_17): New routine to deposit 17 bit

	* hppa-tdep.c (deposit_17):  New routine to deposit 17 bit
	constants into PA instructions.
	* Put #ifdefs around all signal handling code.  Not generally
	needed for embedded boards.
	* (hppa_fix_call_dummy):  Parameterize offsets into call dummy to
	allow different dummys to be used by this code.  Use
	INSTRUCTION_SIZE instead of REGISTER_SIZE for things.
	Conditionalize setup of _sr4export fixup.  Improve comments.
	* config/pa/tm-hppa.h:  Define INSTRUCTION_SIZE.  Use a different
	call dummy if PA_LEVEL_0 is defined.  Better comments for call
	dummys.  Define offsets for LDIL/LDO instructions which load
	function addresses.
	* config/pa/tm-pro.h:  Get rid of signal handling stuff.  Define
	PA_LEVEL_0 to disable mucking with space regs and such.