compile-file: handle gensyms and such.

* parser.c (read_file_common): The entire compiled
representation is now one big list. We must walk the list to
visit the individual compiled top-level forms.

* share/txr/stdlib/compiler.tl (compile-file): Collect all the
compiled top-level forms into one list, and emit it as one
object. This way, gensym references among the items will
resolve; for instance tests/012/man-or-boy.tl now compiles.
That file defines a function named by a gensym, and a macro
which expands to calls to that function. These end up in
separate top-level forms and have to resolve.
Because we are emitting everything as one big object, we
cannot rely on (in-package ...) forms influencing the reading
of the symbols. So we create a dummy package and switch to
that during the writing, which forces all symbols to be fully
qualified.

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