warnings clean up: update and simplify dot_sequences()
warnings clean up: update and simplify dot_sequences()

- do not use numpy.core.umath_tests.matrix_multiply()

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