[Maxima] 2 suggestions for batch() in xmaxima

[Richard Fateman]

1. Allow lines like this:

:lisp (defun $atom_parts (x)(cons '($SET) (newvar x)))

to be in a batch file.  The occasional quick patch in lisp could then
be inserted into the maxima file.

2. When echoing material from a batch file, echo the lines, not
some displayed version.  e.g. I don't really want to see the program
echoed  verbosely with stuff like
   a
-----
   b