Manual de: Move to screen readable font. Three chapters reworked.
po: update Japanese translation
po: update German translation
TaskManager: remove method IsMat()
TaskManager: remove GetStartState() and GetFinishState()

.. and more useless wrappers.  Let callers access OrderedTask
directly.  This is easier to understand, because it clarifies that
this affects only the OrderedTask and not the "active" task.
TaskManager: allocate the task objects dynamically

Reduces header dependencies.
FlightLogger: reset in constructor

Fixes valgrind warning.
Merge branch 'master' of git://github.com/TobiasLohner/XCSoar
NMEA/Attitude: Provide possibility for checking if heading is usable

For the internal "fallback" calculation of the heading heading_available
is never set to true. It is also not possible to set this to true since in
that case the recalculation would be skipped until it expires.

Provide an additional flag to allow checking the "usability" of the
heading regardless of how it was obtained.
GlueMapWindowDisplayMode: Use AttitudeState::IsHeadingUsable()

Fixes a regression introduced in
commit 337a60908c21e7dbd308d3d21be5a7308a1012fa
TrackLineRenderer: Use AttitudeState::IsHeadingUsable()
MapDisplayConfigPanel: add option "Auto zoom"

Previously, this was only available in the menu.
PageActions: make LoadLayout() static
UIState: move attributes to new struct PagesState
PageSettings: add option "distinct zoom"

If enabled, then XCSoar remembers and restores the last map zoom (TRAC
#1603).
Merge branch 'v6.5.x'
Logger/GRecord: remove deprecated keys

These have been out of use for years, and the code that sets them is
not reachable.
Logger/MD5: add struct State, move h0..3 to it

Pass the State struct to method Initialise(), instead of passing four
uint32_t.  Reduces overhead.
RowFormWidget: use AngleDataField in LoadValue(Angle)

This method was never worked ever since we added AngleDataField, but
fortunately it was never used.
WindSettingsPanel: automatically re-enable manual wind controls

.. when the user disables "Prefer external wind".  Fixes TRAC #2336.