Hdf5 1 12 Release Note (#785)

* OESS-98 fix tools test for plugins

* sync fork

* Merge of changes from dev

* Move problem option to bottom of the list until fixed

* HDFFV-11106 - fix parsing optional args

* HDFFV-11106 add note

* grammer fix

* Whitespace after clang formatting

* Undo format version 11 changes

* Update check to working version

* Merge workflow and minor changes from develop

* Update supported platforms

* PR#3 merge from develop

* Merge gcc 10 diagnostics option from develop

* Merge #318 OSX changes from develop

* Merge serval small changes from dev

* fix typo

* Minor non-space formatting changes

* GH #386 copyright corrections for java folder

* revert because logic requires false return

* Merges from develop

#358 patches from vtk
#361 fix header guard spelling

* Remove case statement for H5I_EVENTSET

* Correct call with versioning

* Remove tabs

* Double underscore change

* Merges from develop

#340 clang -Wformat-security warnings
#360 Fixed uninitialized warnings
Remove more underscores from header guards

* Merge #380 from develop

* Correct date entry

* Split format source and commit changes on repo push

* remove pre-split setting

* Change windows TS to use older VS.

* HDFFV-11212 JNI export util and Javadoc

* Suggested review changes

* Another change found

* Committing clang-format changes

* Some Javadoc warning fixes

* Committing clang-format changes

* Updated javadoc fixes

* HDFFV-11228/9 merges from develop

* remove obsolete debug comment

* Fix conflict

* HDFFV-11229 merge changes from develop

* HDFFV-11229 merge second compare from develop

* HDFFV-11229 fix reference file

* HDFFV-11229 update autotools test script for two ref files

* HDFFV-11229 merge dev changes for long double display in tools

* Committing clang-format changes

* Update with changes from develop

* Add "option" command for clang options

* Rework CMake add_custom to use the BYPRODUCTS argument

Update pkgconfig scripts for parallel builds.
Fix install COPYING file reference.
Remove unused round defines.
Change CMake default setting of BUILD_CPP to off.

* Whitespace changes

* Rework CMake add_custom to use the BYPRODUCTS argument

* Revert CMake configure checks for round defines

* With VS 2015 minimum strdup is supported

* Doxygen comments merged from develop

* doxygen build updates

* Correct version string for map functions

* TRILAB-227 and tools debug merge from develop

* TRILAB-227 Enable test

* Quote subset args

* Use MATCHES in compiler id compare, merge from dev

* Revert test enable

* Add file to list

* doxygen version errors

* if blocks needed for build modes

* Update list of test platforms

* Issue #669 remove version from pkgcfg filename

* remove version from h5cc script

* Merge CMake and java refs from dev

* Reworked CMake Fortran configure macros to allow multiple runs.

* Fix CMake issue with tests not comparing test argument properly.

* MAX_PRECISION defines must be defined with a value

* Fix warnings files and -std

* remove std for c++11

* Replace file

* Fix cmake configure path

* Update missing release note info.

* Update code owners

* Correct JIRA note

* Add known problem

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

release_docs/RELEASE.txt

@@ -1040,6 +1040,9 @@ Known Problems
     CPP ptable test fails on both VS2017 and VS2019 with Intel compiler, JIRA
     issue: HDFFV-10628.  This test will pass with VS2015 with Intel compiler.
 
+    The subsetting option in ph5diff currently will fail and should be avoided.
+    The subsetting option works correctly in serial h5diff.
+
     Known problems in previous releases can be found in the HISTORY*.txt files
     in the HDF5 source. Please report any new problems found to
     help@hdfgroup.org.