Can't compile from source without cython.

No charm4py code will run without the greenlet distribution, so we should add that to the install notes. Also, most interesting examples require numba and numpy. So something like:

pip3 install cython greenlet numba numpy

Should be noted as recommended for first time installation from source.

We worked very hard to get everything working in Travis. this demonstrates how to build and run everything, but it would be ideal if we translated this information into documentation for how to build the dependencies.

Plasma currently allows _ for function parameter names, but this makes less sense with Plasma than something with clauses such as ML or Prolog. We should probably remove it simplifying the language. This will (for now) not provide a way for programmers to avoid unused argument warnings, but we can add other ways to suppress these.

Check that these links are appropriate. In general, we should not refer to product docs.

./elements/oneMKL/source/domains/dft/mkl-dft-descriptor-mkl-dft-precision-mkl-dft-domain-commit.rst:66: Functions <https://software.intel.com/en-us/onemkl-developer-refer\
ence-c-status-checking-functions>`__
./elements/oneMKL/source/domains/dft/mkl-dft-descriptor-mkl-dft-precision-mkl-dft-domain-