[desktop] Numeric keypad on by default

[Gunnar Hjalmarsson]

You may want to have the numeric keypad turned on by default when you
start your computer. These are a couple of guides I found on the topic:

https://help.ubuntu.com/community/NumLock

http://askubuntu.com/questions/155679/how-to-enable-numlock-at-boot-time-for-login-screen

They are both partly dated and include bad advices, and I felt we should
better include a concise and working variant in the desktop guide. So I
created this page:

http://people.ubuntu.com/~gunnarhj/numeric-keypad.html

It's not obvious what the best methods are, though, so I'd appreciate
your feedback.

-- 
Gunnar Hjalmarsson
https://launchpad.net/~gunnarhj