clean up ioutils.py, reorganize new functions/classes
clean up ioutils.py, reorganize new functions/classes

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