Problem:    Custom plugins loaded with --clean.
Solution:   Do not include the home directory in 'runtimepath'.

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

Problem:    Defaults are very conservative.
Solution:   Move settings from vimrc_example.vim to defaults.vim.  Load
            defaults.vim if no .vimrc was found.

Problem:    Still using HAVE_STDARG_H.
Solution:   Assume it's always defined.

Problem:    Can't put all Vim config files together in one directory.
Solution:   Load ~/.vim/vimrc if ~/.vimrc does not exist. (Lech Lorens)

Problem:    Cannot run new version of cproto, it fails on missing include
            files.
Solution:   Add lots of #ifndef PROTO