Signed-off-by: Mat Munn <mat@savi.com.au>

Closes #5460

This commit removes most of its contents: it just leaves the
contribution signature. The rest is obsolete and superseeded
by #5460, but the contribution is still valuable.

Related: #4263.
Signed-off-by: Marc Cornellà <marc.cornella@live.com>

The current list of directories to search for autoenv on misses the default location on Ubuntu systems if you just do a normal `pip install autoenv` - [it will place](https://github.com/kennethreitz/autoenv/blob/master/setup.py#L16) `activate.sh` in `/usr/local/bin` unless you manually override the `--prefix` or something.

The `/usr/local/opt/autoenv` is fine for macOS/homebrew installations but it would be nice not to have to manually patch on Linux :)

When making a WIP commit, we generally just want to save the state of the
current branch temporarily, maybe because we want to push our work for backup
purposes, or change branch to work on something else. Therefore, it's generally
undesirable to run Git hooks, which might do things like run linters, because
we probably don't care if our WIP has lint errors.

Fix extract of deb packages with data.tar.xz

`${var:t:h}` uses:

- `${var:t}` which acts as `basename`.

- `${var:r}` which removes the extension.

See http://zsh.sourceforge.net/Doc/Release/Expansion.html#Modifiers

Closes #5462

Update pip plugin to last stable release

Adds the following aliases:

```zsh
alias dco='docker-compose'
alias dcr='docker-compose run'
alias dce='docker-compose exec'
```

And sorts the aliases similar to `docker-compose help` order

* Add copybuffer function and keybinding:

binds ctrl-o to copy the command line buffer to the system clipboard.

* Add README

Fix completion of files with hyphens and underscores

This deletes the previous hack that allowed completing files with
the extension: e.g. `abcd.z` to `abcdefg.z`.

It is still possible to use `abcd[TAB].z`, and hyphens or underscores
are very much more important than this other trick.

Source:
https://github.com/robbyrussell/oh-my-zsh/issues/1398#issuecomment-169163149Signed-off-by: Marc Cornellà <marc.cornella@live.com>

Add "-DgroupId= -DartifactId= -Dversion= -Dpackaging=jar -Dfile=" to options for
"install:install-file" for when you need install a local jar file.

Closes #5376.

Closes #5299

Plugin command-not-found on Arch Linux returns 0 if git or bzr is found in repos, hence outputting unwanted pkgfile output.

Checking if the commands exist first fixes all such issues.