Support for requesting SPOT forecasts.
Cleanup of slocum.py
Got route-forecast running after a couple merge conflicts.

slocum.py route-forecast completes, but the resulting route-file
isn't readable by OpenCPN.

Two broken tests:
testReadCSVok
testReadCSVnoSpeed
Merge branch 'route-forecast-xray' into route-forecast-spot

Conflicts:
	python/slocum.py
Merge pull request #15 from akleeman/route-forecast-spot

SPOT Forecasts