python: initial python module commit

This python module does nothing more than reading a IGC file and
storing it in memory if desired.
po: update German translation
po: update French translation
kobo/rcS: create /dev/ttyUSB0

This is all that's needed to make XCSoar support USB host mode on the
Kobo.  The kernel is responsible for the rest.
Makefile: include Kobo kernel images in KoboRoot.tgz

Depends on kernel images in an external path, defaulting to
/opt/kobo/kernel.
kobo: kernel configuration
kobo/rcS: switch to USB-OTG capable kernel for XCSoar

The init script searches for kernel images in /opt/xcsar/lib/kernel/,
but this commit does not yet contain any information about how to
build these kernel images.
doc: document the Kobo kernel build
IGCFix: Apply() copies extentions, too
python: add FlightPath functionality...

... but without path reduction yet.
python: add small test script
python: add takeoff/release/landing detection method
Flight: make flight reading code it's own method
IGCFixEnhanced: add clock
python: implement polyline reduction code
PythonGlue: Flight.path regards computed fix level
DouglasPeuckerMod: add hard limit for number of points
python: implement flight analysis
python/AnalyseFlight: set limits for OLCTriangle solver
FlightTimes: reset calculated and flying_computer after each flight