changed UVTo... pixel functions according to my calculations. Need to check further if they are correct..
corrected bug in wind direction
Added datatype and made some extra lines for better readability
added some alternative code for taking invalid data into account but later commented it out
Merge branch 'develop' of https://github.com/nansencenter/nansat into develop
added myself as coauthor
Merge branch 'develop' of https://github.com/nansencenter/nansat into develop