provide better default values in MeshIO.read_times()
provide better default values in MeshIO.read_times()

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