Correct double overlay display
Correct spacing
Correct for minimal no OpenGL build.
Refactor S57 SOUNDG rendering logic.
Adjust cm93 scale selection logic to avoid excessive underzoom.
Merge pull request #144 from nkiesel/master

use %lu for size_t in printf
Merge pull request #145 from Ptizef/master

Some grib_pi improvements
Save current track to changes file for rebuild on crash.
Preclude possible fault on Options->Apply.
Implement item append for navobj.xml.changes to improve performance.
Implement deferred track start on carryover to allow GPS to become valid.
Correct VBO implementation for PlugIn vector charts.
Correct S57 ENC soundings rendering for rotated viewport.
Correct S57 AREA object selection logic when using VBO
Correct 0-360 sectored light display (FS#1437)
Correct Route Reverse Cancel option  FS#1436
Improve performance of unrotated OpenGL raster symbols.
Correct inadvertent overwrite of SENCFileLocation in config file. FS#1408
use wxDC#IsOk instead of (at least in wxwidget3.0 non-existent) wxDC#Ok