update SchurComplement - speed tuning
update SchurComplement - speed tuning

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