update dump_to_vtk() for stationary results (no time stepper)
update dump_to_vtk() for stationary results (no time stepper)

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