Extend Saildocs's forecast horizon to 16 days & add wave direction (FS#1220)
Wind Arrows always computed in knots to standard compliance (FS#1237)
Add Beaufort option for wind (FS#993)
Correct regression (iso_lines persistence) & initial setting
Correct rounded data display - Linux
Merge branch 'master' of https://github.com/Ptizef/OpenCPN into Ptizef-master