Nothing drastic in this commit; just takes care of some little
inconsistencies and quibbles.  Probably breaks a few files with calls to
filter utilities, but those should be easy to fix on a case-by-case basis.
I'm renaming them because there's nothing vim-specific about them.

- move a few aliases to bin/
  - tags -> build-tags
  - extip -> get-external-ip
- rename some utils in bin/
  - vim-filter-* to filter-*
  - vertical to filter-vertical
- remove some bogus stuff from bin/
  - googleearth
  - d (some thing i was messing around with for menus)
  - pup (nice util, but should install elsewhere)
- add a bin/cheat to hang cheatsheet stuff on
- use fzf-tmux for h alias

fzf:

  https://github.com/junegunn/fzf

I'm not 100% sold yet, but it's basically dmenu for the shell.  Much to
recommend.  Adds an improved ctrl-r.

unsorted-unique is just a wrapper around a short awk operation.  I put it
in its own script because quoting things in aliases is hard.