* Implement support for loading of Virtual File Drivers as plugins
Fix plugin caching for VOL connector and VFD plugins
Fix plugin iteration to skip paths that can't be opened
* Enable dynamic loading of VFDs with HDF5_DRIVER environment variable
* Temporarily disable error reporting during H5F_open double file open
* Default to using HDstat in h5_get_file_size for unknown VFDs
* Use macros for some environment variables that HDF5 interprets
* Update "null" and "ctl testing" VFDs
HDFFV-7523 JPSS: h5dump fails to open an attribute when using the -a option to specify an attribute with a slash in the name
Description:
Update command line help page and test generating file.
Previous commits: r22052, r22063
Tested:
jam (linux32-LE), koala (linux64-LE), cmake (jam)
A second problem also discovered was an if statement that should have comapered lengths of a string actually was comapring addreeses. Once thatt was fixed, The "[" character could be used but broke other functionality. Consultation with tools team resulted in the creation of a "--no-subset" option to disable interpretation of "[" character as a subsetting compact-form. This also eliminated and cleaned up the code containing the plomatic if statement.
Tested: local linux and added test, CMake updated autotools test to be added next.
h5dump (and h5stat, h5jam/h5unjam) help option not tested. Added h5dump parse_command_line technique for h5stat and h5jam/unjam and created testfiles.
Tested: local linux
