FRE-NCtools release 19.1, or FRE Bronx-19 patch 1 at GFDL sites 1. Added additional and consistent metadata provenance in the form of NetCDF global attributes: git hash of the tools repository, hostname used to compile the tool, tool arguments, creation time, tools site version, and grid version (tool-specific meaning) 2. Updated compilation settings for GFDL-WS and PP/AN sites to not use the optimized Intel math library, which was discovered to cause round-off floating point differences among nodes with different hardware capability (i.e. AVX) 3. Also, added the -xsse2 option for consistency with the gaea compilation settings, which support reproducibility