update get_ref_coors() for new find_ref_coors() C function
update get_ref_coors() for new find_ref_coors() C function

rc/sfepy,lokik/sfepy,lokik/sfepy,vlukes/sfepy,lokik/sfepy,sfepy/sfepy,rc/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,vlukes/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,vlukes/sfepy,sfepy/sfepy,sfepy/sfepy,lokik/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,rc/sfepy