Advance warning: module system and symbol disruptions

[NIIBE Yutaka]

Marius Vollmer wrote:
 > symbols.c cleanup
[...]
 > - Remove builtin variables from variables.c
 > 
 > - Rewrite symbols.c so that it only deals with string/symbol mappings,
 >   nothing else.

I think that those two are very good move.  IIRC, Jost has said
something around here too.

Even user visible change would be OK.  I don't think "binder" in
current module system is useful.  I think that module autoload feature
could be removed, as it is used by nobody (IMO). 
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