Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/3468
This commit includes the tutorial for PQFastScan in the cpp environment.
Reviewed By: junjieqi
Differential Revision: D57631441
fbshipit-source-id: f5e17eee2a584ebfc9ff63868d741d0da6b3b413
* add initial cmake support
* update cmake, add cmake instructions to INSTALL
* update findopenmp and INSTALL
* change FindOpenBLAS.cmake to cater for macports
- change cblas.h to openblas_config.h since macports does not ship
cblas.h with openblas.
* revise INSTALL for cmake