* objcopy.c (struct section_list): Add fields used, adjust, val.

	* objcopy.c (struct section_list): Add fields used, adjust, val.
	(adjust_start, set_start_set, set_start): New static variables.
	(adjust_section_vma, adjust_sections): New static variables.
	(copy_options): Add --adjust-start, --adjust-vma,
	--adjust-section-vma, --adjust-warnings, --no-adjust-warnings,
	--set-start.
	(parse_vma): New static function.
	(copy_usage): Mention new options.
	(copy_object): Handle --set-start and --adjust-start.
	(setup_section): Correct type of last argument to PTR.  Set used
	field if section is removed.  Handle --adjust-vma and
	--adjust-section-vma.
	(copy_section): Correct type of last argument to PTR.
	(mark_symbols_used_in_relocations): Likewise.
	(strip_main): Clear used field when handling -R.
	(copy_main): Handle new options.
	* binutils.texi (objcopy): Document new options.
	* objcopy.1: Document new options.