hdfview

Merging in latest from upstream (HDFVIEW/hdfview:refs/heads/hdfview-3)

* commit '439c016fa856d74dfdb64093142f9a89889c27ec':
  Revert changes
  revert accessMode
  Remove merge conflicts
  Revert another change
  revert change for new merge
  Move url block and correct access mode
  Fix userguide create
  Fix multiple file opens from URL bar