Merge pull request #2 from softwareradiosystems/master

Merge latest from srs
Merge pull request #3 from softwareradiosystems/next

Merge latest from srs
Setting default delay back to 0
Renaming some debug output files for consistency, adding debug flag to preamble detector.
Adding initial scatterplot widget with tests
scatterplot library needs to be -fPIC
Adding simple real vector plotter
Using signals/slots to destroy qwtplots - fixes errors on delete
Adding complex data plotter
Adding complex plotter and waterfall plotter
Cleaned up graphical widgets and made naming consistent
Setting threadcount to system default
Avoiding the use of extra include paths in makelists
Moving spectrogramplot to common so it can be reused
Merge pull request #4 from suttonpd/next

Next
Merge pull request #5 from suttonpd/qt

Merging qt work back into main branch
Adding initial work on spectrogram with tests and cmake support for liquid dsp library
Added quiet to get rid of error when iris_core wasn't installed as a package
Bugfix for SpectrogramComponent
Minor tidy-ups2