Bash: fix split_path() call in `hman`

The `hman` command was looking for the `split_path` command in
~/mac-scripts. However, it has been moved to ~/bin (so that it's
included in this repo.)

We remove the path in hman's call to split_path, since ~/bin is in the
path already. So instead of calling "~/mac-scripts/split_path", it's
just "split_path".
Vim: include filetype in "add modeline" command

This change simply has the "add modeline" command we've written in our
~/.vimrc.after file (default keybinding: <leader>ml) include information
on the file's type. We then update the modeline in ~/.vimrc.after with
this new modeline style.

1 commit.  #   (use "git push" to publish your local commits)