changes needed for wx-3.0, also tested with wx-2.8
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into wx-3.0
Complete "welcome" string
Reduce Numbers spacing range to ovoid cluttered screen
Reduce default direction arrows minimum spacing
Correct pressure level choice misfunction with Linux
Add tooltips and corrects strings
Updated grib_pot file
Correct error built with Linux
Correct S57 ENC processing of UTF-16 data fields. (FS#1343)
Correct "Center View" logic for skewed charts.
Merge pull request #107 from Ptizef/master

Fix linux specific bugs, complete and correct strings, add tooltips and an updated .pot file
Fix Speedometer label drawing for high speeds
Apply global colours scheme on dialogs and overlays #FS232
Implement scaled toolbar
Correct numbers rendering (night mode)
Correct Isoline rendering for no rectangular zone ( Norway forecast for example )
Correct request dialog behavior : geopotential altitude data
only enabled for GFS modele
Correct Grib Overlay orientation
Implement Scrolled property dialogs