[slime-devel] For presentation fans

[Alan Ruttenberg]

I've added xemacs support.
slime-repl-enable-presentations now defaults to t always. Please let me 
know if you have troubles.
xemacs doesn't have :box style, so :bold is used instead for the 
mouseover face.

> - When you copy the text of just a portion of a presentation with 
> meta-w, remove the text properties.

Done. Don't know if I should have just defined a replacement for 
meta-w. Instead I did it with the pre/post command hook.

-Alan