LX1600: Added SetTimeOffset() function
LX1600: Added SetSmartDiffFilter() function
LX1600: Added SetVarioSettings() function
Engine/Task/Ordered/Points: Adjust naming to prepare for use of a configurable safety height.
Merge branch 'lx1600' of git://github.com/Turbo87/XCSoar
Manual: First flush of a French translation.
Manual: Included the french translation into the build.