update ElasticWaveTerm, ElasticWaveCauchyTerm for wave vector argument
update ElasticWaveTerm, ElasticWaveCauchyTerm for wave vector argument

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