Re: psql \df choose functions by their arguments

> * Removed the tab-complete bit, it was too fragile and unhelpful

I can’t speak for the specific patch, but tab completion of proc args for \df, \ef and friends has long been a desired
featureof mine, particularly when you are dealing with functions with huge numbers of arguments and the same name which
Ihave (sadly) come across many times in the wild.  

Removing this because it was brittle is fine, but would be good to see if we could figure out a way to have this kind
offeature in psql IMHO.  

Best,

David