* reloc.c (enum complain_overflow): New enumeration with the

	various flavours of overflow checking.
	(srtuct reloc_howto_struct): Changed complain_on_overflow field
	from boolean to emum complain_overflow.  Removed obsolete absolute
	field.
	(HOWTO): Removed absolute argument.
	(bfd_perform_relocation): Do overflow checking on all types of
	fields.
	* bfd-in2.h: Updated accordingly.
	* all targets: Updated initialization of reloc howto tables.