add docstring to Term.assemble_to(), clean up
add docstring to Term.assemble_to(), clean up

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