Task/Stats: move computer classes to new directory
Math/DifferentialWindowFilter: new library
InfoBoxes/Task: new content "Speed task last hour"
Android release v6.7_preview3
NEWS.txt: add missing line
NEWS.txt: add missing line
Makefile: move variables to java.mk
Android: accept more configChanges

Since the switch to targetSdkVersion 17 (commit 7c2d2b3), XCSoar
always quits when the display orientation is changed, due to the new
configChanges item "screenLayout", which XCSoar did not handle by
itself.
Android: work around spurious rebuilds

Workaround for Android SDK bug.  Don't recompile if nothing has
changed.
IO/GlobalIOThread: clear the io_thread variable in Deinitialise..()
Android/Main: clear global variables on shutdown

Allow reusing the process.
Android: invoke unregisterReceiver()

Fixes callback leak (and warning in logcat).
Android/DownloadManager: free the jclass on shutdown
Audio/VarioGlue: clear global variables on shutdown
Android: move BatteryReceiver to separate Java class

Remove dependency on the NativeView instance.
Android release v6.7_preview4
NEWS: Added CUP file support for the waypoint editor
Android: work around spurious rebuilds

Workaround for Android SDK bug.  Don't recompile if nothing has
changed.
Android: invoke unregisterReceiver()

Fixes callback leak (and warning in logcat).
OpenGL/Texture: un-inline Initialise() and Configure()