Get rid of 10-deck/sampler/preview-deck hard-coding in LibraryControl. Eliminate now-unnecessary use of ControlObjectThreadMain.
Pre-allocate QByteArray size when building message to send in Controller::send.
Fix assumption in PlayerInfo that the number of decks does not change.
Change EngineXfader to use double-precision floating point.
Merge branch 'master' into features_key
Fix warnings here and there.
better commits
relocate seems to work, their still is a problem with loaded tracks
enable downgrading
small changes due to coding guideline
merge with upstream
don't hint reader if new track is loading
Merge pull request #29 from daschuer/atomic-co

Micro optimize ControlObject::set() double vs double&
add comment about library scan
dedicated thread for CachingReaderWorker
Fix mysterious build segfaults caused by build directory virtualization.

Build directory virtualization changed the build directory into a symlink and
relocated the SCons signature cache into cache/$branchname/sconsign.dblite. This
causes strange issues with SCons (and I should have listened to asantoni's
warning comment from 2008. I thought maybe the problems had been related to our
previous build system setup but it appears there is a bug in SCons).

This new method keeps each branch build directory and .sconsign.dblite file in
cache/$branchname/ as before. When you run scons in a particular branch, it
moves the build directory and .sconsign.dblite file to the root and writes a
.sconsign.branch file to keep track of the branch the files are related to.

If you run scons and the .sconsign.branch file does not match the current
branch, the build system moves the current build directory and .sconsign.dblite
file into cache/$oldbranchname/ before moving the data from cache/$branchname/
to the root.

I could reliably reproduce the segfault caused by the symlinking by starting at
SHA f47eca6c, building, and then merging up to SHA 82c4a75 and building. The
resulting binary would segfault on start. This patch fixes the segfault.
Add .sconsign files to .gitignore.
Merge branch 'master' into features_key
Add [Preferences],updated signal that lets other parts of Mixxx know when the preferences dialog has closed (and likely changed a preference). IMO this is prefereable to adding an individual signal for every preference option that might change (e.g. how the time-remaining widget works now).
Merge branch 'master' into features_key

Conflicts:
	src/dlgpreferences.cpp