hdfview

Merge pull request #185 in HDFVIEW/hdfview from ~BYRN/hdfview_adb:master to master

* commit '425908b0210f5534a63328be90b14d774d79e2d0':
  HDFVIEW-151 Make bitfield create work
  HDFVIEW-151 only create datatype id if datatypeSize has value
  HDFVIEW-151 - correct test file and some refactor
  HDFVIEW-151 move BITFIELD to is atomic
  HDFVIEW-151 change default to NATIVE
  HDFVIEW-151 revert NSGN and change is datatypeAtomic
  HDFVIEW-151 revert sign and add tests
  HDFVIEW-151 fix bitfields and SIGN state