Added capablity to accept bounds for interpolation

Possibility to restrict data range before interpolation for the vtk reader. There is a new function restrict_data in `io.utils.misc`.

See merge request empyre/empyre!37

Do not convert to ndarray

See merge request empyre/empyre!33

Fixes #53
Refs #54

Rerun notebooks to update formatting

like (data.real, data.imag, 0) for complex numbers. This will trigger a deprecation warning since NumPy 1.19.

Demos added

Closes #49

See merge request !36

Added demonstration Jupyter notebooks to the demos folder and to the sphinx
documentation (linked via nbsphinx-link).
tools: aspect now also works if textwidth is not specified.
plot2d: quiver now only warns if len(dim)>ncomp (threw error before).
    colorvec now works for len(dim)>ncomp as well (no warning needed).

Convert Pyramid tests to Empyre; bug fixes in field.py

See merge request empyre/empyre!35

 * fixed rotate with reshape=True
 * 2d rotation: fix sign of x component
 * clip: negative values are no longer cut off for scalars
 * re-organized tests and fixtures
 * improve coverage: clip, __getitem__, rotate: scalars, comparisons, ...

Co-authored-by:  <d.weber@fz-juelich.de>
Co-authored-by:  <j.caron@fz-juelich.de>

Last working one is test_mask(), the rest is currently TODO

Co-authored-by: Alexander Clausen <a.clausen@fz-juelich.de>
Co-authored-by: Jan Caron <j.caron@fz-juelich.de>

Support Python 3.6

See merge request empyre/empyre!34

It doesn't look like empyre depends on any new features or changes
in Python 3.7.

See also https://github.com/LiberTEM/LiberTEM/pull/851

like (data.real, data.imag, 0) for complex numbers. This will trigger a deprecation warning since NumPy 1.19.

Release 0.2.1

See merge request empyre/empyre!32

Release 0.2.1

Closes #47

See merge request empyre/empyre!31

vectors.py: More documentations and more fine control over
vector and skyrmion chirality and orientation.
Also fixed create_vector_singularity.
colors: Added a namespace for colormaps
(instead of a dictionary) to ease access to the maps.
CMAP_CIRCULAR_DEFAULT is therefore deprecated now!
plot2d: significantly simplified the symmetric color map handling with
DivergingNorm (which was built for exactly that).

vectors.py: More documentations and more fine control over
vector and skyrmion chirality and orientation.
Also fixed create_vector_singularity.
colors: Added a namespace for colormaps
(instead of a dictionary) to ease access to the maps.
CMAP_CIRCULAR_DEFAULT is therefore deprecated now!
plot2d: significantly simplified the symmetric color map handling with
DivergingNorm (which was built for exactly that).

Release 0.2.0

Closes #45

See merge request empyre/empyre!30

Old version made a copy, new one also looks more pretty :-)

Added assertion that the determined dim has no non-zero entries!
Added distance_upper_bound param to customize non-convex interpolations!

Can be used to specify which axis holds the components.
Also usable by load_field function!
Useful for backwards compatibilty with Pyramid.

3D now always has 3 components, 2D only if theta is specified!

Added some more documentations, added io.rst.
Converted scale to floats everywhere it is set by default.
Removed superfluous enumeration in reader/writer in io_field.
Fixed vector default and name saving in ovf.py.
Fixed vector default and necessity of dim in tec.py.
Fixed erronous dim -> scale assignment in vtk.py.
Fixed interp_to_regular_grid not using the multidim. scale correctly.

Release 0.1.0

Closes #39, #8, #12, #14, #16, #17, #18, #26, #36, and #42

See merge request empyre/empyre!29

from tests_requires to extras_requires:tests

due to origin being lower, not higher as is default in maptlotlib

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