[Ecls-list] TRACE should now work

[Juan Jose Garcia Ripoll]

Hi,

I have fixed a stupid typo in trace.lsp which prevented anyone from tracing 
functions.

> (defun fac (n) (if (<= n 0) 1 (* n (fac (1- n))))) (trace fac) (fac 3)
FAC
> (FAC)
> 1> (FAC 3)
| 2> (FAC 2)
|   3> (FAC 1)
|   | 4> (FAC 0)
|   | <4 (FAC 1)
|   <3 (FAC 1)
| <2 (FAC 2)
<1 (FAC 6)
6

STEP does not work yet, though, and I think it is not easy to write a good 
substitute when the evaluation model is based on a bytecodes compiler and 
interpreter. Suggestions are welcome.

Juanjo