pitkajuh

Remove references to Python 2 in preparation for the release of Root 6.32

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Support for Python 2 will be dropped in Root version 6.32. Please see https://github.com/root-project/root/issues/13861. The purpose of this PR is to make updating Root easier.

Update Ubuntu/Debian optional packages install command

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The original command contains packages which are virtual (see https://www.debian.org/doc/debian-policy/ch-binary.html#virtual-packages). Running the command gives the following message ```bash Note, selecting 'libglu1-mesa-dev' instead of 'xlibmesa-glu-dev' Note, selecting 'libgraphviz-dev' instead of 'graphviz-dev'...

[TMath] Add moving mean, moving median and mode

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# This Pull request: ## Changes or fixes: Dear all. This pull request adds moving mean, moving median and mode to Root's TMath. I tried to update the documentation (https://root.cern/doc/v630/namespaceTMath.html)...

[TMath] Add Gradient and Laplacian methods for arrays

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# This Pull request: ## Changes or fixes: Dear All. This pull request adds gradient and Laplacian methods for arrays. These can be used to calculate one-dimensional first and second...

Fix Laplacian filter wrong sign #7357

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## Description This pull request fixes #7357 ## Checklist - A descriptive but concise pull request title - [Docstrings for all functions](https://github.com/numpy/numpy/blob/master/doc/example.py) - [Unit tests](https://scikit-image.org/docs/dev/development/contribute.html#testing) - A gallery example in...