elastodynamic.py: support 2D mode, change EBCs, dimensions, quadrature order
elastodynamic.py: support 2D mode, change EBCs, dimensions, quadrature order

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