[MLton] upcoming release

[Matthew Fluet]

> Also, how about removing allowSymbol and deprecating
> allow{Export,Import}, since we have allowFFI?

I've done this, and also deprecated warnMatch.

One issue is that having updated our sources to avoid the deprecated 
annotations, the sources now use annotations that are not known to MLton 
20041109.  Hence, there are some warnings issued when compiling with an 
older verion of MLton, but they are benign.