* eval.c (eval_intrinsic): We don't need to make an environment

here if the env parameter is nil. The low level environment
lookup functions already handle nil.
(do_eval): Do not type check the env argument for the ENV type.
(expand_forms, expand): No need to default a missing menv to a
blank environment; just use nil.
(macro_form_p): Take menv parameter and switch to lookup_mac
from gethash.
(macroexpand_1, macroexpand): Use the environment parameter
by using lookup_mac rather than gethash.
(eval_init): Fix registration of macro_form_p to reflect new
optional argument.

* txr.1: Documented optional environment parameters in macro-form-p,
macroexpand-1 and macroexpand.
Documented macrolet.

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