Added source_url related warning and info messages
Added source_url related warning and info messages

A deprecation warning is logged when the source_url was specified
exclusively via the extractData() return value. Also, a info message
is displayed when no source is specified at all.

git-svn-id: f50160b2b845c6bcd4e57c8186383b5eb743a915@938 5ec1a27d-59bc-451c-a1e5-77859e3e35f3

HappyFaceMonitoring/HappyFace,HappyFaceMonitoring/HappyFace,HappyFaceMonitoring/HappyFace