Version 1.3.0

• as of this version pip install navis won't install a vispy backend (see install instructions for details)
• new interface to fetch data from Virtual Fly Brain: navis.interfaces.vfb
• tools to build custom NBLAST score matrices (big thanks to @clbarnes): see the new tutorial
• Bayesian implementation of the network traversal model: navis.models.network_models.BayesianTraversalModel (big thanks to @aschampion)
• NBLASTs: new approx_nn parameter (sacrifices precision for speed)
• example neurons now come with some meta data
• new morphometrics functions: navis.segment_analysis &navis.form_factor
• new function to write meshes: navis.write_mesh
• lots of fixes and improvements in particular for i/o-related functions