Problem:    Build fails with tiny features.
Solution:   Change #ifdef for hash_clear().  Avoid warning for unused
            argument.

Problem:    Cannot make Vim fail on an internal error.
Solution:   Add IEMSG() and IEMSG2(). (Domenique Pelle)  Avoid reporting an
            internal error without mentioning where.

Problem:    Modelines in source code are inconsistant.
Solution:   Use the same line in most files.  Add 'noet'.  (Naruhiko Nishino)

Problem:    Small build fails.
Solution:   Adjust #ifdefs.

Problem:    Cannot use empty dictionary key, even though it can be useful.
Solution:   Allow using an empty dictionary key.

Problem:    Using old style function declarations.
Solution:   Change to new style function declarations. (script by Hirohito
            Higashi)

Problem:    Still using __ARGS.
Solution:   Remove __ARGS in several files. (script by Hirohito Higashi)
            Also remove use of HAVE_STDARG_H.

Problem:    IOC tool complains about undefined behavior for int.
Solution:   Change to unsigned int. (Dominique Pelle)