update Equation.from_desc() to use ETermBase.set_verbosity()
update Equation.from_desc() to use ETermBase.set_verbosity()

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