kill register_appobject_class method, simplifying autoregistration. Update test accordingly (test which manually registers object should also properly call there __register__ method). Drop the disable-appobjects config file entry: no one used it since its introduction years ago.

from cubicweb.devtools.testlib import CubicWebTC
from cubicweb.web import uicfg

class UICFGTC(CubicWebTC):

    def test(self):
        self.skip('write some tests')

if __name__ == '__main__':
    from logilab.common.testlib import unittest_main
    unittest_main()