Correct small display problem in request dialog
Add possibility to get "moving zone" grib files from Saidocs(#fs1087)
Correct NMEA MDA sentence checksum calculation.
Correct Dashboard wind speed history logic to use MWD sentence.
Correct wind and baro history graphics for linux systems.
Merge pull request #94 from Ptizef/master

Add the "moving" grib file option  from Saildocs
Improve GRIB Pi memory footprint, correct wind direction arrows in course-up mode.
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into mainline