* README: Add pointer to internals doc, and describe reading

* README:  Add pointer to internals doc, and describe reading
info files.
* utils.c (print_sys_errmsg):  Use stderr.  Reported by Pierre Willard.
* symtab.c (output_source_filename):  Remove old glop for wrapping
lines, use wrap_here.  Reported by Pierre Willard (pierre@la.tce.com).
* Makefile.in:  version.c should depend on Makefile, not Makefile.in.
* munch:  Add sort -u to avoid duplications.
* symtab.c (lookup_symbol):  Improve Stu's fix of 22 April.
Improved fix by hahn@sunshine.labs.tek.com (Doug Hahn).