from tests_requires to extras_requires:tests

utils: Has quaternion and misc submodules
    misc has levi_civita and interp_to_regular_grid (used later for io)
field: Added HyperSpy support (get/set_signal)
    added copy/rotate/rot90/set_vector/get_vector methods

Also added mayavi to requirements in setup.cfg and environment.yml.
Added documentation on how to activate 3D notebook plotting with mayavi.
Fixed some bugs in io_field.py.
Fixed bug in reader of llg.py.

from tests_requires to extras_requires:tests

utils: Has quaternion and misc submodules
    misc has levi_civita and interp_to_regular_grid (used later for io)
field: Added HyperSpy support (get/set_signal)
    added copy/rotate/rot90/set_vector/get_vector methods

Added the fields submodule with field, shapes and vectors!
Added the vis module (not viz) with colors, decorators, plot2d, tools.
Added version.
Minor changes in pyramid.