Safer D first draft

[Richard (Rikki) Andrew Cattermole]

I should mention, I did not consider the escape analysis in the form 
proposed as being turned on. Depending on how the analysis works, this 
could throw up a lot of false positives, where you want it to be highly 
liberal in what is allowed.

Each error will need confirmation that it is liberal in what it allows, 
and is highly cherry picked on what it disallows. But we can do this on 
a case by case basis, not here.