First pass editing Base Guide Ch2

I've had a first pass through Chapter 2 of the Base Guide, doing
consistency cleanup of layout and styles, and put the result on
ODFAuthors and the wiki. I intend to work on editing the content over
the next week, but I may do consistency cleanup of Ch3 first.
Meanwhile, I've uploaded Dan's copy of Ch3 to the wiki, along with my
edited version of Ch1. I have also given Chs 2 & 3 names that fit our
naming convention.

http://www.odfauthors.org/libreoffice/english/base-guide/draft-4.x
https://wiki.documentfoundation.org/Documentation/Publications#LibreOffice_Base_Guide

--Jean