Add reader/writer for NIFTIv1 and NIFTIv2 files.
This patch adds support for reading and writing NIFTI files, as well as full access to the NIFTI header. Versions 1 and 2 of the NIFTI header are supported, and the reader can also be used to read Analyze 7.5 files, though the only Analyze header elements that are supported are the ones that overlap with NIFTI. Automatic compression and expansion for gzipped files is also provided whenever the filename ends with a .gz extension. Change-Id: Iead3afb1a65d8c01aa52f3ca55c6da2f08703375
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