Bug fixes and improvements

MATLAB:

• New functionality:
  • split_surfaces.m
  • surface_to_graph.m
  • load_group_mpc.m
• Bug fixes:
  • Fixed a bug where the example data loaders failed when the BrainSpace
    directory was not named "BrainSpace".
  • Matrix sparsification now correctly thresholds -inf.
  • The "Running with sparsity parameter..." message will now correctly
    display with every kernel.
  • Fixed a bug where joint embedding of non-square matrices would fail.
  • plot_hemispheres will no longer error when using non-float data.
• Other changes:
  • Optimized the spin_permutation code. It should now run substantially
    faster, especially with a large number of permutations.
  • Improved several warning/error messages.
  • Moved execution of custom kernels to after the sparsification.

Python:

• gradient:
  • Fix bug in alignment (remove centering and scaling)
  • Add support for procrutes alignment of one subject to reference in
    GradientMaps
  • Remove dependency on _graph_is_connected from scikit-learn
• datasets:
  • Add load_group_mpc
• mesh:
  • Update build_polydata with new vtk_interface
  • Add downsample_with_parcellation to mesh_operations
  • Fixed a bug with mask for smooth_array and add support for
    multicomponent arrays (columns). Smooth columns separately.
• parcellation
  • Fixed a bug in find_label_correspondence
• plotting:
  • Add plotting defaults
  • Add build_plotter
  • Update plot_surf
  • Remove numpy warning plot_hemispheres
• vtk_interface:
  • Reorganize and add several wrappers
  • Update wrap_vtk to look for superclasses is BS wrapper doesn't exist
  • Add support for vtkSringArray and vtkVariantArray
  • Add vtype kwarg in decorators for unwarpping numpy to vtk abstractarray
  • Add support for dict arguments
  • Add automatic wrap/unwrap output/input of vtk methods
  • Add new repr
  • Add wrappers BSActor2D, BSScalarBarActor, BSTexturedActor2D, BSTextActor
  • Add AddScalarBarActor and AddTextActor methods for BSViewport
  • Add io_support from mesh here
• tests:
  • Update tests with new vtk_interface
• requirements:
  • Update to scikit-learn>=0.22.0
  • Remove pillow

ReadTheDocs:

• Added matrix fusion example to tutorial 2.