Terrain/RasterProjection: Fix underflow of AngleToWidth()

Fixes regression in terrain rendering introduced in commit
a1e2f9d41580bc4c49fd6cfb7fa05f9451984d11

(observed on Dell Streak with ESP_C_HighRes.xcm)
po: regenerate xcsoar.pot
DeviceEditWidget: enable I2C pressure sensor in release version.
Math/ARange: Fix Overlaps() test

Fixes trac issue #2561.

Regression introduced in commit c5936d74bf380709c33a32a83b4897a74d042d77.
Merge branch 'master' of git://git.xcsoar.org/xcsoar/apf/xcsoar
Manual: Build always twice to have index etc. up to date, also when in debug mode.
Manual avionics and airframe (de): Correct multiple defined label.
Android/IOIO: Add java files for voltage measurement.
Android/IOIO: New cpp and hpp files for voltage measurement.
Android: Support voltage measurement on IOIO board.
Merge branch 'master' of git://github.com/hjr/XCSoar
german manual 6.4 some correctiones