start non-scalar variables support in ETermBase.einsum() (WIP)
start non-scalar variables support in ETermBase.einsum() (WIP)

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