* Set objectname on all parsers to be able to distinguish between
them more easily when debugging
* Add some unit tests about pass-through of data we need in the
gcc parser to the parsers that enhd up in front of the gcc parser
This is to address QTCREATORBUG-1917.
* Fix the GCC output parser misinterpreting "At top level" messages
as Errors instead of a simple message.
* Add unit test to cover this
Task-number: QTCREATORBUG-2202