These were missing a `%`.

Turns on syntastic checking for Perl, and adds podchecker so it'll also
catch errors in POD.

Changes the marker xmobar is using for currently active workspace.

...they'd been disappearing behind other windows.

This is as much as I will know how to Haskell anything until the next
time this shit breaks.

This layout really needs a bigger monitor to be of much use.

...seems like a more lightweight way of providing various settings to
Gtk apps (and maybe other stuff? I'm not sure).

Various other font tweaks and such in this commit.

- messes with DPI & fonts
- changes trayer height
- rewrites chunks of xmonad.hs to use EZConfig style bindings, rofi for
  launcher and i3lock for a lock screen (thanks @benlemasurier), and a
  slightly different set of layouts.  also handles some fancy laptop keys
  like volume adjustment.  still need to steal casey & tyler's stuffs for
  backlight handling, probably.

for now, i'm going to keep these changes in a separate branch rather than
attempt to make them work on all of my systems.  I'm running Debian Stretch
on here and the monitor is giant, so it would likely be a hassle, and it's
small enough that i can probably just manage as a separate branch as long
as needed.

...just kinda taking it for a spin.

Moving stuff to a home/ subdirectory turns out to have been a painful
idea, because I had symlinked to a bunch of paths that went away.  This
really needs some kind of abstraction over the top of it, even if it's just
a script to manage the links.