Template parameter numbering

[Daveed Vandevoorde]

> Daveed:  you commented once that your export template scheme required
> some mangling adjustments.  Is that an issue for what we have
> specified?

I don't anticipate it to conflict with what is there now, though we are
still working on this.  

The basic problem is that an exported template specialization can refer to 
entities  with internal linkage coming from different translation units.  
That means that one of these entities will need to be promoted to have 
external linkage, and a mangling trick will need to ensure that there are 
no collisions.

	Daveed