* Fix some string/symbol output problems with regards to substrings.
* Fix error output to prefer procedure name parameters over stack data.
* Use SCM_(SET_)?FILENAME where appropriate.
* Prefer calling scm_remember over scm_protect/unprotect_object calls.
scm_make_port_classes, scm_change_object_class,
scm_memoize_method): Changed to ordinary functions (was plugin
slots).
* goops.c (wrap_init, scm_wrap_object): Unconditionally use
SCM_STRUCT_GC_CHAIN.
(scm_goops_version): Removed.
(scm_oldfmt): and all uses of it: Removed.
(scm_shared_array_root, scm_shared_array_offset,
scm_shared_array_increments): Removed.
(scm_init_goops): No need to support two arg mutex init.
Removed #include "versiondat.h", #include "goops.h".
