Add comment about crossfading when scalers switch.
Delete mixxx-win32lib-msvc.
Cherry-pick .gitignore from master_sync and add some Mixxx-specific folders.
Add emacs lock-files to .gitignore.
Remove Bazaar support code and .bzrignore.
Merge branch 'master' into features_key
Remove existence tests for .sconf_temp and .sconsign.dblite from Debian rules.
Try to fix Ubuntu build by turning off build directory swapping when building debs.
Provide  when cleaning in Debian rules.
Merge branch 'master' into features_key
Add librubberband-dev to Debian control files.