Basic application flow, exception based.
Implement basic QTestLib XML output parser.
Implement extracting series and configuration from data tag.

Series and configuration are extracted using the settings Input/SeriesRX
and Input/ConfigurationRX (both are regex and expected to capture one
value).
Implement setting a configurable label, and grouping by it.
Store the basename of the input file in the filename property.

This is supposed to hold information related to the test revision,
especially in the case of multiple input files.
Add support for Message elements by skipping them.

Also add another larger QTest benchmark sample file to test multi-file
merging.