quiver_field now allows interpolation.

Removed warnings for tight_layout (get rid sooner or later!)
And another environment update (pyFFTW now again accessible via conda!)

dataset: plot_mask now takes kwargs.
fielddata: pad now allows mode changes.
phasemap: fixed bug that did not properly scale vmin and vmax with unit.
io_vectordata: added support for .vtk, .tec files and new interpolation.

Removed magdata from Diagnostic constructor.
Proper logging for DistributedForwardModel.

forwardmodel: DistributedForwardModel should now properly close pipes.

forwardmodel: DistributedForwardModel now has __del__ method
(not working as it should, processes still live on...)

also: now works with logging instead of printing!
projector: Fixed bug with shape of impacts (was erroneously transposed)!
regularisator: Regularisator base class now in __all__!

PM updated for fielddata

See merge request caron/pyramid!13

environment.yml: upgraded to scipy=1.0

fielddata: fixed tests!

projector: RotTiltProjector now ends in the correct coord system!
diagnostics: Refined the LCurve class (now saves stuff!)
lorentz: Added preliminary Lorentz imaging functions!

1: Rotate arbitrary axis onto the x-axis (with rotation around z)
2: Tilt around this new x-axis (this produces the tilt series)
3: Rotate back around z, so that the x-axis is where it was before!
Assumption: The arbitrary tilt axis lies in x-y!

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!)