Console: Change Caps Lock to Home

Xmodmap does not work when Emacs is used in the console (accessed with
Ctrl+Alt+[F1-F6]) rather than X11. It's still reasonably simple to
change.

Enter the keymap directory (see bottom of `man loadkeys'), and make a
copy of your preferred keyboard layout. I use the Dvorak keyboard
layout on Void Linux, so my commands are:

$ cd /usr/share/kbd/keymap/i386/dvorak/
# cp dvorak.map.gz xah-fly.map.gz
# Emacs xah-fly.map.gz

N.B. Debian and derivatives users may need to install the console-data
package:

# apt-get install console-data
$ cd /usr/share/keymaps/i386/dvorak/
# cp dvorak.kmap.gz xah-fly.kmap.gz
# Emacs xah-fly.kmap.gz

The Caps_Lock key is usually bound to keycode 58, and Home to 102, but
you should check these yourself using the `showkey' command.

Keymaps often already contain a Caps_Lock binding; just query-replace
`Caps_Lock' with `Home'. The Home key generally needs an extra line to
change it to Caps_Lock:

keycode 102 = Caps_Lock
!N.B. End this file with a blank line.

Test out your new keymap with the `loadkeys' command:

# loadkeys xah-fly.map.gz

On most Linux distributions, load this keymap at boot by editing the
relevant line in /etc/rc.conf to read:

KEYMAP=xah-fly

Debian-based distributions instead require you to add this line to
/etc/default/keyboard:

KMAP=/usr/share/keymaps/i386/dvorak/xah-fly.kmap.gz