1 10 Merges from develop (#424)

* HDFFV-10865 - merge from dev, HDFArray perf fix.

* Remove duplicate setting

* Whitespace changes after clang format

* Undo version 11 clang format changes

* Merge CMake changes from develop

* test testing script merge from develop

* Update supported platforms

* PR#3 merge from develop

* Merge gcc 10 diagnostics option from develop

* Merge #318 OSX changes from develop

* Merge small changes from develop

* Minor non-space formatting changes

* #386 copyright corrections for java folder

* Merges from develop

#358 patches from vtk
#361 fix header guard spelling

* Merge updates

#358 patches from vtk
#361 fix header guard spelling

* format fix

* Fix missing underscore and make H5public.h closer to dev

* Merges from develop

#340 clang -Wformat-security warnings
#360 Fixed uninitialized warnings
header guard underscore cleanup
JNI cleanup

* format alignment

* Add missing test ref file

tools/test/h5diff/testfiles/h5diff_603.txt

@@ -132,6 +132,18 @@ usage: h5diff [OPTIONS] file1 file2 [obj1[ obj2]]
       (The option --follow-symlinks overrides the default behavior when
        symbolic links are compared.).
 
+ Subsetting options:
+  Subsetting is available by using the fcompact form of subsetting, as follows:
+    obj1 /foo/mydataset[START;STRIDE;COUNT;BLOCK]
+  It is not required to use all parameters, but until the last parameter value used,
+  all of the semicolons (;) are required, even when a parameter value is not specified. Example:
+    obj1 /foo/mydataset[START;;COUNT;BLOCK]
+    obj1 /foo/mydataset[START]
+  The STRIDE, COUNT, and BLOCK parameters are optional and will default to 1 in
+  each dimension. START is optional and will default to 0 in each dimension.
+  Each of START, STRIDE, COUNT, and BLOCK must be a comma-separated list of integers with
+  one integer for each dimension of the dataset.
+
  Exit code:
   0 if no differences, 1 if differences found, 2 if error