modular: numpy - remove source dirs

for linux and MacOS
numpy: use pip install dependency

numpy 1.6.2 was/is used

Conflicts:
	external/common/requirements.txt
modular numpy: dont copy files,

pip already instelled them in proper location
numpy installed by pip fix includes
numpy: update to the latest stable version

from 1.6.2 -> 1.7.1
release notes http://sourceforge.net/projects/numpy/files/NumPy/1.7.0/

Conflicts:
	external/common/requirements.txt
add source tarball for numpy to pip cache
remove numpy license, it's a dependency now