Hello,

This closes a number of loop-holes, and makes XM and TM files very 
clearly deprecated.

The attached explicitly deprecates tm-*.h and xm-*.h.  Instead of adding 
an XM_FILE to the config, autoconf magic needs to be used.  Instead of 
adding a TM_FILE to the config, extensions to the architecture or target 
vector need to be made.

I'll look to commit this in a week,
Andrew