Added EngineFilterLinkwtzRiley
Added filter analysis functions
Added a LinkwitzRiley8EQeffect stub
git added Linkwitz-Riley mix to the Eq effect
disabled IIR_ANALYSIS
Added gain ramping
Merge branch 'master' into linkwitzriley
Remove useless initialization
Declare fMid; just don't initialize it
Merge branch 'master' of https://github.com/mixxxdj/mixxx into coverArtSupport

Conflicts:
	src/soundsource.cpp
Cosmetic fix - database schema - removing tabs (using only spaces)
Cosmetic fix - removing tabs (using only spaces)
Resolve merge conflicts
cosmetic fixes - fixing identation
Added pauseFilter() to skip old filter fading when it is still invalid
This is the case after pausing ther filter or just after starting
Merge branch 'master' of https://github.com/mixxxdj/mixxx into effect_graphic_eq
Remove empty lines from enginefilteriir.h
Pause filter if it is not processed
Minor coding style improvements
Pass Biquad filter's Q parameter to setFrequencyCorners()