Test PINTS w more recent dependencies

[MichaelClerx]

• Updated copyright in license file
• Stopped using newshape argument in np.reshape (long since deprecated)
• Fix in emcee to avoid setting an array element with a sequence error (ignored before 2.4)
• Removed matplotlib <2.2 compatibility code, removing need for distutils.Looseversion
• Syntax fix to CongLogPDF.sample (ignored before 2.4)
• Indexing fix to MultimodalGaussianLogPDF (ignored before 2.4)

[MichaelClerx]

Fixes #1712

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d4440e3) to head (e6b3b6a).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1713   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           97        97           
  Lines         9699      9693    -6     
=========================================
- Hits          9699      9693    -6     

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