* cygcheck.cc: Include cygprops.h.

	* cygcheck.cc: Include cygprops.h.
	(del_orphaned_reg): New option variable.
	(unique_object_name_opt): Ditto.
	(handle_reg_installation): New function.
	(print_reg_installations): Ditto.
	(del_orphaned_reg_installations): Ditto.
	(memmem): Ditto.
	(handle_unique_object_name): Ditto.
	(dump_sysinfo): Call print_reg_installations from here.
	(usage): Add usage for new options --delete-orphaned-installation-keys,
	--enable-unique-object-names, --disable-unique-object-names, and
	--show-unique-object-names.
	(longopts): Add new options --delete-orphaned-installation-keys,
	--enable-unique-object-names, --disable-unique-object-names, and
	--show-unique-object-names.
	(main): Handle new options.
	* utils.sgml (cygcheck): Change documentaion accordingly.