Structure update (page_build, page_discuss, Build.txt).
Update Build.txt

Update to Build notes, update to Downloads.
Fix AsciiDoc macros.

Also, set up the dialog correctly on opening of an existing account.

Typo fix in dbus.c.

First attempt to SFLphone-gtk editing, please comment :)

Fixed the arrow in the content/images too.

Removed old screenshots.

We'll delete them right after, just to save them in the repos.

Moved images from doc/images to www/images since they are backend specific, and
need not be sitted beside the actual documentation (the 'NOTE' icon might
not be taken from the same place when rendered to a PDF later).

That way, we'll be able to use those icons elsewhere on the website, without
fetching them from the repository. They aren't going to be updated, also,
and thus don't need versioning very much.

Tiny fix for Build.txt

Conflicts:

	src/managerimpl.cpp

Thanks

Conflicts:

	.gitignore
	src/Makefile.am
	src/managerimpl.cpp

Working DBus

We can now retrieve files from the git repository without passing them
through `asciidoc`. This allows us to retrieve images, etc..

- Attempt to implement image rendering.

Shortened the sleep() call in the thread, so that we could have less latency
when calling sendAudioFromMic(), since we check to have a full buffer before
sending.

Le tout est synchronisé avec le Manager, pour qu'on traite l'audio
et qu'on prenne le micro seulement quand c'est notre appel qui est en
cours.