fixed Output.prefix property so that remembered prefix can be restored
fixed Output.prefix property so that remembered prefix can be restored

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