costfunction: chisq_m/a now track their results (better way?)
diagnostics: added LCurve class (not finished), comments for SVD
fielddata: properly ordered properties, added plot_field for ScalarField
phasemap: fixed bug for symmetric=False, cmap=None (no proper default!)

Added environment.yml and requirement.txt.
GitLab should now produce html coverage artifacts.
io_vectordata: now warns if grid spacing is not equal in all directions.

cmocean, hyperspy to yml file.

Signed-off-by: Jan Caron <j.caron@fz-juelich.de>

Smooth_vortex now can have a homogeneous core with radius larger 1.
Hacky solution for PyQt4/5, change later!

Changed ignore files.