fix vertex data reshaping in GenericFileSource.add_data_to_dataset()
fix vertex data reshaping in GenericFileSource.add_data_to_dataset()

- new GenericFileSource._reshape()

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