CI quick fix

Correct code formatting for zephyre source class

Remote Bazefetcher source

add python 3.9 support tests and deployment

--add python 3.9 compatibility check
--revise wheel deployment scripts (remvoed yum commands, because not
needed, it was a relic from old times)

Switch from travis to circleci

Freeze pandas to version 1.0.3

Merge pull request #199 from jokva/add-tag-not-found

Add TagNotFoundError for tag misses in Bazefetcher

Calculate veer and wind direction

Currently only accurate to +-1.8 deg/m.

Fix planar wind speed reconstruction

There was a math error in the original planar wind speed reconstruction.
Fixing this error broke an assumption made earlier and required some
major changes. The description of the new solution is in the docstring
for camille.process.lidar.planar_windspeed.

Merge pull request #155 from ErlendHaa/rolling-median

Add rolling median filter processor