Add support for unsigned data types #166
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I found an old discussion of unsigned data here: #126.
Since that discussion, unsigned bytes, shorts and ints were added to the CF data types in CF 1.9.
This PR would add support for Netcdf-java's unsigned datatypes. The numeric datatypes handled here include the ones previously handled (
FLOAT,DOUBLE,BYTE,INT,SHORT,LONG) and adds support forUBYTE,UINT,USHORT,ULONG.Additionally, this PR adds a test for reading unsigned data and a small refactor of an existing test.