[Xastir] Old Ubuntu Installation Notes

[Lee Bengston]

I'm thinking we don't need installation notes for Ubuntu versions older
than 12.04.  Does anyone have any concerns about deleting those from the
Wiki?

I've been updating installation notes mainly to reflect the change to
Github. Here are a couple of examples.

http://xastir.org/index.php/HowTo:Ubuntu_14.04-16.04
http://xastir.org/index.php/HowTo:Debian_Jessie

The two above not only include installation via Git, but also get us up to
date on both Ubuntu and Debian.

I'll also be looking to combine some of the existing notes so that we don't
have so many.

Lee - K5DAT