[m-dev.] diff: type_name/1 et al

[Fergus Henderson]

Tyson Richard DOWD, you wrote:
> 
> Otherwise this is fine. When everything but the higher-order problems
> are addressed, commit away.  (Later, we should look at higher order, and
> fix any missing cases).

I fixed all the things you mentioned except the higher-order problems;
for them I just documented that it doesn't yet work for higher-order types.

I also added an XXX regarding module qualifiers in type names.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3         |     -- the last words of T. S. Garp.