VIP v0.9.9

Thanks to @r4lv, @VChristiaens, @jmilou, @ChrisDelaX who made some of the contributions below. Changes since VIP v0.9.8 :

• Dropped Python 2.7 compatibility.
• Removed plotting module. VIP now imports the package HCIplot.
• Improved test suite (pipeline for both ADI and ADI+mSDI).
• Improved detection function.
• New options for the S/N computation.
• Better handling of versions in requirements file.
• Bug-fix in PCA for 4D arrays.
• Bug-fix phase_function module.
• Bug-fix in get_eigenvectors when ncomp = None.
• Improved OOP interface (HCIDataset, HCIFrame and HCI).
• Improvements to the vip_hci.metrics.roc module.
• Coverage reports with codecov.io.
• Updated ANDROMEDA algorithm.
• Added the stim module (detection map) in metrics.
• Improved documentation in several functions/classes.