Update Install.md for linux build in anaconda environment (#1944)
Update Install.md for linux build in anaconda environment (#1944)

* Update Install.md

* Allow optimization in linux/anaconda build.

Remove '-DRDK_OPTIMIZE_NATIVE=OFF' from linux build in anaconda env, to allow optimization.

* Set path to numpy headers for cmake build

Set PYTHON_NUMPY_INCLUDE_PATH variable to find numpy headers in linux/anaconda build.

* Updated note on numpy headers

Replaced instructions to link numpy headers into anaconda/include dir with note on the headers being hidden inside the package.

ptosco/rdkit,ptosco/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,greglandrum/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,rdkit/rdkit,greglandrum/rdkit,ptosco/rdkit,rdkit/rdkit,rdkit/rdkit,rdkit/rdkit,bp-kelley/rdkit,ptosco/rdkit,ptosco/rdkit,ptosco/rdkit,greglandrum/rdkit,greglandrum/rdkit,greglandrum/rdkit,greglandrum/rdkit,ptosco/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,rdkit/rdkit,greglandrum/rdkit,rdkit/rdkit,greglandrum/rdkit,rdkit/rdkit,rdkit/rdkit,ptosco/rdkit