Reworking the Linux parts of the doc to be simpler and only give advice
that can be followed easily (the re2 stuff with Mercurial was removed
because it's a rat-hole and currently needs a manual patch to the sources
which is not something that this document should be trying to describe.


git-svn-id: http://libphonenumber.googlecode.com/svn@736 ee073f10-1060-11df-b6a4-87a95322a99c