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When ZSH_TMUX_UNICODE=true then tmux is informed that UTF-8 is supported.

Closes #5166

Fixes #8418

* Remove current directory from sys.path in python invocations

* Change project URL from robbyrussell to ohmyzsh org

* Update git remote to use ohmyzsh org repository

This prevents the jenv plugin from messing up the PATH and putting `user/local/bin` back at the front of the PATH, undoing any careful setup done before enabling this plugin.

Running `source ~/.zshrc` can have side effects, it's better to reload the whole 
zsh session with `exec zsh`.

Use add-zsh-hook to add functions to hooks. That way they won't be added again
when doing `source ~/.zshrc` multiple times.
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Also more quiet extraction. -D for cpio was not used due to additional
output.

Change `itunes` to `music`, as iTunes was renamed to Music in _**macOS** Catalina 10.15_
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Fixes #8368

* Update http to https in Solarized
* Upgrade http to https for 'Burger In Your Shell'
* Upgrade http to https for tmux.github.io

Piping stdin to emacs alias on MacOS was breaking (--tmpdir is not
supported in BSD flavored mktemp).

Tested in MacOS 10.14 and debian:buster to confirm it still works in
linux.

Fixes #8337

Never use `[[` for numeric comparisons, for that, we’ll use `((`.

Deleting `.mypy_cache` did not work, because the directories were not
empty.  They contain JSON files instead of compiled byte-code.

This extends the cleanup by also getting rid of `.pytest_cache`
directories.

https://github.com/rust-lang/cargo/blob/cdac4a8/src/etc/_cargo

Sync completion with original source.