* dbus/dbus-internals.h (_DBUS_INT_MAX): add _DBUS_INT_MIN
	_DBUS_INT_MAX

	* dbus/dbus-test.c (main): add list test, and include
	dbus-test.h as intended

	* dbus/dbus-hash.c (_dbus_hash_table_remove_string)
	(_dbus_hash_table_remove_int): return value indicates
	whether the entry existed to remove

	* dbus/dbus-list.c: add linked list utility class,
	with docs and tests

	* dbus/dbus-hash.c: add TODO item about shrinking the hash bucket
	array sometimes.