hdfview

Merge pull request #89 in HDFVIEW/hdfview from ~JHENDERSON/hdfview:hdfview-3 to hdfview-3

* commit '22e54f3f38cf0d66275f980b44406767d2ef7eab':
  Only convert Attribute data to List if it isn't already a List
  Fix for 3D compound attributes
  Tidy up the log a bit for Compounds
  Add isInteger() and isFloat() to Datatype class
  Convert all comparison to Datatype.CLASS_COMPOUND into isCompound() form
  Make Attributes re-use the same data provider as ScalarDS
  Remove unnecessary isTextData() function
  Correct indentation to reduce Datatype changes diff
  More Datatype normalizations