Better handling of dot position function calls.

The expander now actually produces apply forms for dot
position function call and dwim forms.  This allows symbol
macros to work naturally.

* eval.c (sys_apply_s): New symbol variable.
(imp_list_to_list, dot_to_apply): New static functions.
(expand_forms, expand_forms_lisp1): We now throw an error if a
non-nil atom terminates a form, Except in compatibility mode
with TXR 137 or less, whereby we emulate the old behavior of
not expanding this atom.
(do_expand): Perform the dot_to_apply transformation
on the arguments of the dwim form.
Perform the dot_to_apply transformation on an
entire function call form.
(eval_init): Initialize sys_apply_s and register
sys:apply function (using the same function object that
is registered under apply).

* txr.1: Documented that both DWIM forms and regular
function call forms work as if by a transformation to apply form,
removing verbiage which separately described the DWIM
handling. Documented that symbol macros work properly in
dot position.

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