Support GStreamer 0.10 or 1.0

Chimara now supports GStreamer 0.10 or 1.0; however, Inform is
constrained in which one it picks, since WebKit also uses GStreamer and
linking to both versions of GStreamer in the same process is not
allowed.

So, you can specify --with-sound=no or --with-sound=gstreamer to
configure, and it will examine which libraries WebKit links to in order
to determine which version of GStreamer to use.
Rename "Errors" panel to "Results"

Rename all the variables in the code as well and update comments.
Initialize Documentation panel on left side

The documentation wasn't being loaded on the left side, so clicking on
Documentation showed a blank page. This loads the documentation
initially without updating the history for the left side pane.