Change dotfile script.

Don't when symlinking to what are going to become the dotfiles, don't
add dots before the filenames in home. So, eg, src/foo/dotfiles/bar is
linked to from ~/bar, not ~/.bar. This means that if bar should have a
dot before it, it will have to be stored as src/foo/dotfiles/.bar

This is better becuase it allows us to handle files we want in $HOME
that don't start with a dotfile (if we ever need to). It's also more
consistant because you always open, eg, .bashrc by typing vim .bashrc,
never vim bashrc

Note that unrelated changes were mistakenly added to this commit. One of
the src/dotfiles/vim files changed for sure, and maybe some others.
Change vim colorscheme.