Correct and improve scrolling function in mail request dialog
Merge pull request #227 from Ptizef/master

Correct and improve scrolling function in mail request dialog
Correct scale calculations for very small scale viewP points.
Support display overzoom blur effect for OpenGL cards without nPOT textures.
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN
add fallthrough cases for plugin api 1.12