Make DuckDuckGo an easier default

[Chris Warburton]

Currently we can type "g" to 'go to URL', and if we type "g<TAB>" it
will autocomplete to "google " ready for a search query.

We should really be using DuckDuckGo, but there are two problems:
firstly it is called "duckduckgo", which means we can't just hit the
same key repeatedly. Second, we can't even use "d<TAB>" to autocomplete
since "dictionary" also begins with "d".

How about we change the "duckduckgo" entry to just "g", and change
"google" to "realgoogle" (as opposed to "!g" via duckduckgo).