zsh: Remove executable bit on rc/profile
vim: Don't test if features exist before using features

In all versions of Vim I'm using now, these exist.
vim: Make it obvious that we want fo+=r for mail
vim: Instead of removing search word, toggle hlsearch on Insert
vim: Do not allow wrapping with movement keys
shells: Fix global shell config path
vim: Manually toggle hlsearch with H
vim: Reset highlighted search when hitting /