update assemble_contact_residual_and_stiffness()
update assemble_contact_residual_and_stiffness()

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