#2054 Wrong TRACE instructions produce incorrect errors

[Josep Maria Blasco]

     1 *-* Trace 3.14
Error 24 running C:\Tests\\test.rex line 1:  Invalid TRACE request.
Error 24.1:  TRACE request letter must be one of "ACEFILNOR"; found "3".

[Josep Maria Blasco]

Also

     1 *-* Trace - x
Error 26 running C:\tests\test.rex line 1:  Invalid whole number.
Error 26.7:  Number used in TRACE setting must be a whole number; found "X".