handle nicely typical installation other than debian package / mercurial forest
* new _find_prefix method to detect installation prefix (maybe specified using
CW_INSTALL_PREFIX environment variable)
* set various resource accessors according to this, cleanup on the way
* remove no more necessary APYCOT_ROOT hacks
"""pre 3.6 bw compat"""
# pylint: disable-msg=W0614,W0401
from warnings import warn
warn('moved to cubicweb.mixins', DeprecationWarning, stacklevel=2)
from cubicweb.mixins import *