Build and run options for NAMD performance and scaling on Intel Xeon Phi Knight's Landing.

There appears to be an AVX-512 vectorization bug in the Intel 17.0 compiler that breaks the non-KNL-optimized NAMD kernels. As these kernels are used for alchemical free energy and other non-standard simulations that require special non-bonded kernels we strongly recommend sticking to the 16.0 compilers. There is little if any KNL performance benefit from the 17.0 compilers. For this reason the Linux-KNL-icc and CRAY-XC-KNL-intel arch files report an error if an intel/17.0 module is loaded.

See also NamdOnOmniPath.