added expose and oneway decorators
attr lookup now actually honors 'private' attributes in all cases (name starting with underscore-- these are blocked from remote access no matter what)
added METADATA config item (default True, set to False to disable it and get Pyro 4.26 behavior back)
added REQUIRE_EXPOSE config item (default True, everything is exposed. Set to false to cherry pick with @expose)
echoserver gained a few more methods to test the new decorators
proxy._pyroGetMetadata method added. Is used internally as well if METADATA is enabled, to obtain info about remote object.