Adde Finnish airspace

- Fixes #324
templates/flights/view: added link to all flights of specific date
Merge pull request #336 from ScotteC/master

View single flight : Added a link back to list of all flights at day of currently viewed flight
Merge branch 'upload'
Merge remote-tracking branch 'tazle/airspace-fix'
commands.import.srtm: add option to add raster data in-db
frontend/views/users: show flashmessage after successfull registration
airspace_list: update airspace files
commands.import.airspace: ensure the validity of added geometries
commands.import.airspace: use inconspicuous user agent for wget

Some servers seem to block the usual wget user agent...
Merge remote-tracking branch 'scottec/master'
model.flight: add QNH column
lib.xcsoar.analysis: store QNH from xcsoar analysis

Let the analysis take some more fixes before takeoff and after landing
to calculate the QNH based on the altitude difference between the recorderd
pressure altitude and the terrain height on ground.
setup.py: update xcsoar module version to 0.3

This one adds QNH processing
lib.xcsoar.flightpath: set QNH if provided
lib.xcsoar.flightpath: rename altitude to gps_altitude in FlightPathFix
views.upload: use baro altitude for barogram
views.track: fix forgotten FlightPathFix field name change
worker.tasks: update FlightPathChunks inside async task only

This saves a couple of 100 ms per flight on upload in the frontend.
lib.geo: add FEET_PER_METER constant

[18:56:58] <roeles> please, do not repeat magic constants :)