VFD SWMR: sync with develop (#830)

[vchoi-hdfgroup]

• Normalization with develop

• Removes checks and work-arounds for strtoll and strtoull (Removes checks and work-arounds for strtoll and strtoull HDFGroup/hdf5#769)

• Removes checks for (v)snprintf, which are C99 (Removes checks for (v)snprintf, which are C99 HDFGroup/hdf5#772)

• Update missing release note info. (Update missing release note info. HDFGroup/hdf5#776)

• Replaces the H5_OVERRIDE macro with override (Replaces the H5_OVERRIDE macro with override HDFGroup/hdf5#773)

The macro is no longer necessary now that we require C++11.

• Cleans up some POSIX header bits in H5private.h (Cleans up some POSIX header bits in H5private.h HDFGroup/hdf5#783)

• Removes outdated checks for ways inline might be defined (Removes outdated checks for ways inline might be defined HDFGroup/hdf5#781)

These are obsolete now that we require C99.

• Removes checks for system(), which is C89/90 (Removes checks for system(), which is C89/90 HDFGroup/hdf5#782)

• Removes C++ dependency on H5private.h (Removes C++ dependency on H5private.h HDFGroup/hdf5#774)

• Removes C++ dependency on H5private.h

Most C API calls have been removed, aside from a few uses of free,
where we just dropped the 'HD'. A couple of H5_ATTR_UNUSED macros
were also replaced with (void) statements.

• Committing clang-format changes

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

• Further simplifies Autotools type size checks (Further simplifies Autotools type size checks HDFGroup/hdf5#789)

Also fixes an issue where clock_gettime and difftime are not detected
due to earlier simplifications of this code.

• Release Note (Release Note HDFGroup/hdf5#784)

• Normalization of CMake H5pubconf.h with Autotools (Normalization of CMake H5pubconf.h with Autotools HDFGroup/hdf5#791)

Mostly just moving things around and changing the comments to keep the
delta small. The only symbol change is that for curl/curl.h which I
changed to H5_HAVE_CURL_CURL_H to match the Autotools. This symbol
is not used in the library and is just an artifact of the checks.

• Fix tools test (Fix tools test HDFGroup/hdf5#794)

• Removes ancient Autotools cruft (Removes ancient Autotools cruft HDFGroup/hdf5#790)

• Reorganization of C and POSIX headers in H5public.h & H5private.h (Reorganization of C and POSIX headers in H5public.h & H5private.h HDFGroup/hdf5#793)

• Reorganization of C and POSIX headers in H5public.h & H5private.h

Consolidated and removed duplicates

• It turns out Windows has sys/types.h

Co-authored-by: Larry Knox lrknox@hdfgroup.org

• Removes checks for signal and set/longjmp, which are C89 (Removes checks for signal and set/longjmp, which are C89 HDFGroup/hdf5#798)

Also removes checks for setjmp.h and stddef.h

• Assume frexpl/f and fabsl/f, which are C99 (Assume frexpl/f and fabsl/f, which are C99 HDFGroup/hdf5#799)

• Assume the library has C99 types in C++ type code (Assume the library has C99 types in C++ type code HDFGroup/hdf5#806)

• Assume the library has C99 types in C++ type code

• Committing clang-format changes

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

• Removes obsolete equivalents of C99's func (Removes obsolete equivalents of C99's __func__ HDFGroup/hdf5#800)

• Cleans up POSIX/C bits in H5private.h (Cleans up POSIX/C bits in H5private.h HDFGroup/hdf5#804)

• Cleans up POSIX/C bits in H5private.h

• Assume difftime exists (C89)

• Reorg AC_CHECK_HEADERS so headers are in alphabetical order

• Split off networking-related AC_CHECK_HEADERS

• Remove unused UNAME_CYGWIN from configure.ac

• Remove checks for unused sys/timeb.h

• Tidying pass over H5private.h HD prefix macros

• Tidy H5win32defs.h

• Add HD prefix to various scanf calls

• Committing clang-format changes

• Fixes to the alarm(2) code used in the tests to make Windows happy

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

• Brings the tools getopt(3) replacement into the main library (Brings the tools getopt(3) replacement into the main library HDFGroup/hdf5#803)

• Moves get_option from the tools library to the C library

• Adds H5 prefix to get_option call and variables

• Renames the H5_get_option long options struct and enum

• Removes type guesses when C99 types are missing (Removes type guesses when C99 types are missing HDFGroup/hdf5#807)

• Assume C99 types exist in H5detect.c (Assume C99 types exist in H5detect.c HDFGroup/hdf5#808)

• Fixes parallel issues from recent C99 changes

• Adds MPE FUNC --> func changes missed in earlier PRs

• Fix typo

• Fixes parallel issues from recent C99 changes (Fixes parallel issues from recent C99 changes HDFGroup/hdf5#809)

• Fixes parallel issues from recent C99 changes

• Adds MPE FUNC --> func changes missed in earlier PRs

• Even more missed FUNC --> func macros

• Removes remaining H5_TIME_WITH_SYS_TIME cruft (Removes remaining H5_TIME_WITH_SYS_TIME cruft HDFGroup/hdf5#810)

Mostly from CMake

• Merges with develop

• Committing clang-format changes

• Normalization with develop

• direct_chunk test and H5Dget_chunk_storage_size changes

• Removes unused H5O call

• Brings some dataspace changes from the combo branch merge

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Larry Knox lrknox@hdfgroup.org