minor schema serialization optimization:
* remove verbose handling, no more necessary since server.set_debug
* remove old bw compat code
* other cleanups
"""pre 3.6 bw compat"""# pylint: disable-msg=W0614,W0401fromwarningsimportwarnwarn('moved to cubicweb.mttransforms',DeprecationWarning,stacklevel=2)fromcubicweb.mttransformsimport*