netCDF-C 4.6.2-rc1

The changes from the previous version include (but are not limited to):

• [Enhancement] Create a new version of _NCProperties provenance attribute. This version (version 2) supports arbitrary key-value pairs. It is the default when new files are created. Version 1 continues to be accepted.
• [Enhancement] Allow user to set http read buffersize for DAP2 and DAP4 using the tag HTTP.READ.BUFFERSIZE in the .daprc file.
• [Enhancement] Allow user to set http keepalive for DAP2 and DAP4 using the tag HTTP.KEEPALIVE in the .daprc file (see the OPeNDAP documentation for details).
• [Enhancement] Support DAP4 remote tests using a new remote test server locatedon the Unidata JetStream project.
• [Enhancement] Improved the performance of the nc_get/put_vars operations by using the equivalent slab capabilities of hdf5. Result is a significant speedup of these operations. See GitHub #1001 for more information.
• [Enhancement] Expanded the capabilities of NC_INMEMORY to support writing and accessing the final modified memory. See GitHub #879 for more information.
• [Enhancement] Made CDF5 support enabled by default. See Github #931 for more information.
• [Bug Fix] Corrected a number of memory issues identified in ncgen. See GitHub #558 for more information.