Meshing: improve vector

• Meshes: Non-backwards compatible changes in construct_mesh
  (origin_and_widths; estimate_gridding_options) when providing
  vector's (implemented non-backwards compatible as the old rules were not
  intuitive nor logic; previous meshes can still be obtained, mostly, by
  setting the parameters carefully).

  • Priority-order changed to domain > distance > vector (before it was
    domain > vector > distance).
  • A provided vector is new trimmed to the corresponding domain if it is
    larger than a also provided domain (from domain or distance);
    trimmed at the first point where
    vector <= domain[0], vector >= domain[1].
  • A vector can new also be smaller than the defined domain, and the
    domain is then filled according to the normal rules; the last cell of
    vector in each direction is taken as starting width for the expansion.

• Bugfixes and maintenance:

  • Removed functions and modules that were deprecated in v1.2.1.
  • Fixed kwargs-error when adding add_noise explicitly to
    Simulation.compute().
  • Python 3.10 added to tests; Python 3.7 tests reduced to minimum.