Fix matplotlib set_*lim API deprecations

Add RGB to grayscale example to gallery

…cubes_warning

TST: filter warning from `correct_mesh_orientation` in tests

…m_bytes

MNT; handle deprecation warnings in tifffile

…e#3572)

* Filtered out DeprecationPendingWarning for matrix subclass
* Remove test of scipy version, we don't know when it's going to be
fixed.

Co-Authored-By: sciunto <[email protected]>

DOC: Improve the RANSAC gallery example

…ogram

…w_contrast_check

make the low contrast check optional when saving images

Add image.sc forum badge to README

* Improve visual_test.py

Do not run the script when running pytest on an inplace build.
Clean-up and speed-up (10x) calculations of the donuts volume.
Many style fixes, passing flake8.

* Use contextmanager

* vectorize donut computation in visual_test.py

* pep8

this file uses matplotlib.animation to create and save the animation

__all__ being on the first line looks wrong, but according to the PEP08 guidelines, that's how it should be.

…tions

this file uses matplotlib.animation to create and save the animation

__all__ being on the first line looks wrong, but according to the PEP08 guidelines, that's how it should be.

…tions