Pninexus

- Dataset.fill_value methods added ([127](https://github.com/pni-libraries/python-pninexus/pull/127))

- ImageFlags wrapper added ([125](https://github.com/pni-libraries/python-pninexus/pull/125))

- python-pni changed to python-pninexus ([121](https://github.com/pni-libraries/python-pninexus/pull/121))
- Path.absolute property fixed ([120](https://github.com/pni-libraries/python-pninexus/pull/120))
- Path_is_root() method added ([120](https://github.com/pni-libraries/python-pninexus/pull/120))

- support for an image file buffer ([99](https://github.com/pni-libraries/python-pninexus/pull/99))
- Integer class properties ([100](https://github.com/pni-libraries/python-pninexus/pull/100))
- Float class properties ([101](https://github.com/pni-libraries/python-pninexus/pull/101))
- Filter.is_encoding_enabled() and Filter.is_decoding_enabled methods ([102](https://github.com/pni-libraries/python-pninexus/pull/102))
- ExternalFilters class ([103](https://github.com/pni-libraries/python-pninexus/pull/103))
- NBit, SZip, ScaleOffset filters ([104](https://github.com/pni-libraries/python-pninexus/pull/104))
- float16 type ([105](https://github.com/pni-libraries/python-pninexus/pull/105))
- complex types ([107](https://github.com/pni-libraries/python-pninexus/pull/107))
- Compound datatype class ([107](https://github.com/pni-libraries/python-pninexus/pull/107))