[web2py] Error messaging improvements

[pbreit]

I saw a post on web2py-developers about error messaging. I love the 
ticketing system but one thing that always surprises me is that it never 
seems to include any of the current variables or environmental info. Would 
it make sense to add information like that or am I missing it? This is 
especially maddening with the "KeyError" errors which it seems would be 
simple to resolve if I could just see the variables.