Tighten up environment visibility semantics of default argument

init forms, while streamlining the implementation.

* eval.c (bind_args): Get rid of opt_init_parm array hack;
turns out we already have a useful function for extending an
environment object, namely env_vbind: hitherto unused!  We now make a
blank environment upfront and extend it destructively with env_vbind.
Except that after evaluating an init form, we create a new environment:
this is in case a lexical closure was made by the init form, in which
event we don't want to be destructively manipulating the environment
any more.

* txr.1: Clarified.

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