Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop)
* commit '30776671fb0a27a98b0640aa968f850241a862ce': (31 commits)
* Fix intermittent error with Splitter VFD. Mismatch in time of test file creation was creating false negatives.
Added note for HDFFV-10591.
Fix HDFFV-10591
Reduce overhead for H5open, which is involved in the public symbols like H5T_NATIVE_INT, etc.
Remove unnecessary version conditions for Clang compilers.
Fix for HDFFV-10961: Couple changes to the tests' usage output files for h5clear.
Fix for HDFFV-10961: add description to usage for --increment option.
Add c++ to --enable-sanitize-checks option.
Remove duplicate entries in MANIFEST.
Make changes to CMake CompilerFlags.cmake files so extra flags are loaded for non-GNU compilers.
Fix MANIFEST
Add tests for all version to H5_NO_DEPRECATED_SYMBOLS section and to section for current version, with and without default API version flags.
HDFFV-11000: update-testh5cc.sh.in to test sample versioned functions in HDF5 1.10, 1.12 and develop.
Remember the info for the last ID looked up for a given ID type.
Eliminate allocating file & memory offset & length arrays when performing I/O on a single element.
Update new clang files to not pick up clang as vendor for pgCC. Add new files to MANIFEST Temporary demotion of 2 -Werror warning flags that fail on macos 10.12 Remove Production flag unknown to Apple clang.
Remove redundant metadata cache tagging from some low-level internal chunk functions. The metadata cache tagging has already been done by routines further up the call stack.
Clean up code to get clang version in config/linux-gnulibc1
Minor normalizations with HDF5 1.10.
Add flags from config/clang-warnings/*general files to H5 C and CXX flags for all versions of Clang and Clang++ compilers. Switched from cut to awk in testcheck_version.sh.in to avoid dependence on tab vs. " " in version definitions in H5public.h.
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