update tests/test_poly_spaces.py for Bernstein basis
update tests/test_poly_spaces.py for Bernstein basis

- update _gen_common_data(), test_partition_of_unity(), test_continuity()

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