Fix link to gst-uninstalled now that it's been moved, and fix a typo
while we're at it. Also add a new section to 'Building GStreamer from
git' that points to the 'How do I develop against an uninstalled copy
of GStreamer' section.
Replace all mentions of CVS with git. Add link to gst-uninstalled script in cgit and to SubmittingPatches page in wiki. Fix some typos. Update indenting rules to what we actually use (#571646).
