Correct NMEA route/waypoint output format for Furuno GP3x series.
Correct toolbar rendering to eliminate ghosts.
Correct ALT-TAB navigation action on Windows. (FS#1633)
Correct Windows build rules to allow Structured Exception Handling.
Correct potential stack buffer corruption.
Correct PlugIn Vector chart overzoom rendering.
Set upper bound on overzoom rendered line width for good performance.
Update S57 data schema to include Navionics ANNOTA object class attributes.
Provide user warning when ENC update chain is incomplete (FS#1406)
Update Options->Display->Advanced "blur/fog" message.
Merge pull request #3 from OpenCPN/master

Merge commits from Dec 23 and 24