#219 Directory autocomplete assumptions

[Graeme Lennon]

In Launchy 2.0, when using tab to autocomplete directory names, the first possible entry is assumed to be correct and a / is appended to the name. This means you have to backspace an then scroll down to find the intended entry.

A more elegant solution would be, if there is ambiguity in the name, to autocomplete up to the closest point and then display the suggestions list. This is how most tab autocomplete systems work.