Don't alias default font.
Remove unused import.
Add better default fonts.
Add terminal emulator button and field.
Remove redundant exit button placement.
Fix indent.
Replace needless buttons with labels.

Old rll used checkbuttons to enable settings. You had to enter something
in a text field and make it active by pressing the corresponding button.
Let's just make the setting active if there's anything in the field, and
not if not.
Make fields really have an effect.
Remove needless separate host entry field.

This was intended for back when rlogin was in common use. Now, remote
hosts are always ssh. Maybe someday when mosh'll be common we'll give a
choice.
Add and wire up remote host feature.
Alignment fixup.