Core alias "sudo" for alias expansion

[arcticicestudio]

Add a core alias sudo to fix alias expansion when running a user alias via sudo:
alias sudo='sudo '

Bash only checks the first word of a command for an alias, any words after that are not checked.
That means in a command like sudo pacman, only the first word (sudo) is checked by bash for an alias, pacman is ignored. This can be changed by adding a space to the end of the alias value so bash checks the next word after the alias.

Snippet of the official bash manual:

The first word of each simple command, if unquoted, is checked to see if it has an alias. If so, that word is replaced by the text of the alias.
[...]
If the last character of the alias value is a blank, then the next command word following the alias is also checked for alias expansion

More information and this alias can also be found in the Arch Linux Wiki for sudo.