* fhandler_registry.cc (encode_regname): Add Parameter add_val.

	* fhandler_registry.cc (encode_regname): Add Parameter add_val.
	Append "%val" if add_val is set.
	(decode_regname): Remove trailing "%val". Change returncode accordingly.
	(__DIR_hash): New class.
	(d_hash): New macro.
	(key_exists): New function.
	(fhandler_registry::exists): Remove encode of registry name before path
	compare, decode file part of path instead.  Skip checks for keys if
	trailing "%val" detected.
	(fhandler_registry::fstat): Change check of return value of
	decode_regname ().
	(fhandler_registry::readdir): Allocate __DIR_hash.  Record key names in
	hash table. Append "%val" if key with same name exists. Fix error
	handling of encode_regname ().  Set dirent.d_type.
	(fhandler_registry::closedir): Delete __DIR_hash.
	(fhandler_registry::open): Don't open key if trailing "%val" detected
	by decode_regname ().
	(open_key): Ditto.