NeXus hack for a very limited access to the library

Aim

To read ISIS muon data, such as::

EMU00020882.nxs

into python without compiling any os-dependent code. (nexusformat reader.py from https://github.com/nexusformat/python-nxs is broken on in python3)

Requisites for the hack

You just need a nexus library installed as, e.g.::

libnexus1 [/focal,now 4.4.3-4 amd64 on Ubuntu 20.04] on macos see https://github.com/nexusformat/code/blob/master/README.macos on windows with `<https://github.com/nexusformat/code/blob/master/README.cygwin`_ if you have https://www.cygwin.com/ on windows with https://github.com/nexusformat/code/blob/master/README.VS2008.pdf if you have Visual Studio 2008

To understand what's inside EMU00020882.nxs it is useful to have::

nexus-tools [/focal,now 4.4.3-4 amd64 on Ubuntu 20.04]

Python 3

This hack works only with python3

How

python3 trymunxs.py (requires that matplotlib and numpy are installed, but only for this demo purposes)