Added outstanding UI component: SOS.Info.  These controls allow for
informational panels to be distributed around the application, which
hook into the SOS (via defined event handlers) to show context-sensitive
metadata.  They can also be used for displaying static content, such as
the context-sensitive help panels etc.  Alongside this, some major SOS
request/response handling that is missing from a stock OpenLayers
install has been added to the core SOS module (such as describe sensor
handling).