Merge pull request #271 from artas360/master

Adding numpy count_nonzero & minor template fix
Import harmonization

* Sort import
* Use absolute import only
* Expand "import *"
* Remove unused import
Stricter type checking for ndarray conversion

Fixes #276

As a side effect, correct a mis declaration in a test ;-)
Fix omp performance issue using a manual condition
Merge pull request #275 from pbrunet/import

Import harmonization
Merge pull request #263 from pbrunet/enable_omp

Fix omp performance issue using a manual condition
Merge pull request #277 from serge-sans-paille/ndarray-type-check

Stricter type checking for ndarray conversion
Adding numpy::isclose support
Fixing allclose bug w/ infinite values