update SDLinearElasticTerm for 1D
update SDLinearElasticTerm for 1D

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