Silenced test output
A couple of additional tests, to get to 100%
Merge pull request #1554 from bashtage/medcouple-silence-tests

TST: Silenced test output introduced in medcouple. Add tests.
ENH: Optimize Cython code. Use scipy blas function pointers.
DOC: Mention arma speed-ups in release notes
COMPAT: Try to use Python 2/3 function declaration.
TST: Suppress not assert on possible warning.