Iris-ued

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The package now only has dependencies that can be installed through `conda`

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This is a minor bug-fix release that also includes user interface niceties (e.g. link to online documentation) and user
experience niceties (e.g. confirmation message if you forget pixel masks).

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This new version includes a completely rewritten library and GUI front-end. Earlier datasets will need to be re-processed.
New features:

* Faster performance thanks to better data layout in HDF5;
* Plug-in architecture for various raw data formats;
* Faster performance thanks to npstreams package;
* Easier to extend GUI skeleton;
* Online documentation accessible from the GUI;
* Continuous integration.