v0.8.4

• Added BrillouinZone class to easily create BrillouinZone plots etc.
  When calculating the eigenspectrum of a Hamiltonian one may pass
  the BrillouinZone object instead of the k-point to retrieve all
  eigenvalues for the k-points in the BrillouinZone object.
  Say for a PathBZ one can now easily retrieve the band-structure.

• Enabled specification of Hamiltonian connections across supercells via
  a tuple index (as the last index):

  >>> H[io, jo, (-1, 0, 0)]
  

  Thus connecting orbital io and jo across the -1 first lattice vector

• Enabled tbtrans files to attach a geometry (to get correct species).

• API change of:

  read/write_geom => read/write_geometry
  read/write_sc => read/write_supercell
  read/write_es => read/write_hamiltonian
  

  Moved quantity to physics.

• Enabled slice deletion in SparseCSR

  Enabled eliminate_zeros() to remove unneeded values.

• Added ScaleUp compatibility. sisl now acceps ScaleUp files which is
  a 2nd principles code for large scale calculations using Wannier
  functions.

• Added Hamiltonian.sub/remove/tile for easy extension of Hamiltonian
  without having to construct the larger geometries.
  This should speed up the creation of really large structures
  as one may then simply "update" the Hamiltonian elements subsequently.