LAF Autocomplete not showing all functions

[d.healey]

The autocomplete popup previously showed a list of all available LAF functions when you type laf.registerFunction( but that's no longer the case.

[Christoph Hart]

@d-healey yeah, I tried fixing some autocomplete issues inside namespaces, but I failed miserably and broke other things.

I've reverted some changes and added a few minor improvements to the autocomplete popup.