cython: use new base evaluation functions
cython: use new base evaluation functions

- update _eval_base() of LagrangeSimplexPolySpace, LagrangeSimplexBPolySpace,
  LagrangeTensorProductPolySpace
- remove PolySpace.clear_c_errors()

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