Using 'register' and ^L

[Dmitry Antipov <dmantipov@yandex.ru>]

1) Is there a reason to use explicit 'register' variables nowadays?
    This encumbers sources with no measurable benefits; moreover,
    some GC tracing/debugging techniques assumes that you can take
    an address of any Lisp_Object, which is effectively blocked by
    using 'register'.

2) Why still using ^L?  It looks like a huge empty space in patches
    showing as attachment in some e-mail clients, and I'm curious
    whether someone still uses a printing system relying on ^L page
    breaks :-).

Dmitry