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- Allows for the user to turn on auto-correction using the
$ENABLE_CORRECTION variable
- Adds aliases regardless of variable assignment to aid users that use
setopt to turn correction back on in their zshrc

user@host:~ $ sudo vim /etc/rc.conf
zsh: correct 'vim' to '.vim' [nyae]? 

http://www.zsh.org/mla/users/2012/msg00028.html

Using the correct_all option is too distracting, and needs a lot of
`nocorrect` aliases to work around this.

Using only "correct" to correct the command itself is more friendly.

It breaks "ebuild <foo> manifest", as there are Manifest files in the directory.