* Make sure the subplot selected in the tree is shown in the multiplot viewer.
* Clean up multiplot toolbar handling a bit
* Remove old summary plot toolbar.
* #7575 Summary HDF : Do not import summary if no UNSRMY file is found
* #7575 Summary HDF : Add optional check on time stamp of h5 file
* Use std::filesystem to check file access
* Do not keep h5 file open