hdfview

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

* commit 'bdea1829344fc5fd61ff1c5457308c62a48c463e':
  Fix UI test for new VLEN display style
  Fix reload file as read-only/read-write functionality
  Fix data validators for variable-length strings
  Fix H5Datatype's fromNative() calling H5T methods on wrong datatypes
  Implement some missing FileFormat functions in H4File.java
  Small fix for soft links