changed default extend arg to True
changed default extend arg to True

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