Adds a --file option that will either:

  - pull the date from a vimwiki filename
  - pull the date from a p1k3 entry path
  - pull the day from file's mtime

Aggregates some stuff by date range.

This is Tyler's bash version, just because it doesn't have much in the
way of dependencies.

firefox-wrapper: start firefox (a workaround for some $PATH nonsense).

edit-clipboard: open current contents of clipboard in $EDITOR, write them
back to clipboard.  relies on xclip.

mcd(): a function to make a path and cd into it.

This should be slightly more correct and doesn't result in an extra blank
line.

See: https://p1k3.com/2016/7/11/ - "extracting all (?) of the filenames
from packages available in debian"

Uses comm(1) and bash process substitution to show filenames common between
two directories.

From https://github.com/brennen/snowday

Useful for figuring out what $PATH things run in the window manager
environment but not from within a shell can see.

In vim, replaces a slightly more convoluted invocation of bin/today.

This has very little utility, but might demonstrate a general
approach for using Lynx as a viewer for HTML files generated from some
other source and editing them from there.  You hit `e` in Lynx and it
calls whatever editor is defined.

Hit `o` to set options and change the
editor in there to lynx-wrapper-edit, making sure to hit the "write
changes to disk" or whatever it says checkmark before applying changes.

This works by taking the path that Lynx passes off for the filename to
edit, changing part of that path with sed to reflect where the source
file is, and then handing that to vim to edit.  After vim finishes, it
re-renders the static HTML files that Lynx is viewing.

I've come to rely on this thing, for better or worse.  Mostly as a way
to paper over the hilariously inconsistent clipboard behavior of a modern
apps like browsers.

Useful for screenshot directories and such.