expander: new rule for macro-produced function calls

* eval.c (do_expand): When a function call's arguments are
expanded and produce a transformation, then if that function
call had been produced by a macro, the transformed function
call is tried again as a macro. This is necessary because
TXR Lisp allows a symbol to be both a function and macro.
When a macro-produced function call's arguments are expanded,
the macro version of that function may, as a result of the
argument transformations, have more opportunities for expansion.

* txr.1: New section outlining how macro expansion generally
works, with a special focus on this unusual new rule.

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