Autocomplete clann commands with readline

[ChrisCreevey]

To implement a list of commands for autocomplete in readline to use to prompt the user when they press 'TAB'. This will allow the user to just start typing the command and hit 'tab' to allow them to get the command they want.

Questions related to this, should autocomplete prioritise commands over files in current directory when autocompleting?

A good overview of this is here