Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Minor display correction
Add manual mail request area selection option (typing or drawing) (#FS1235)
Consistent install locations for plugins
Upgrade the bundled pugixml to 1.5 for improved performance and reduced memory footprint
Merge pull request #208 from Ptizef/master

Minor display correction
Merge pull request #211 from nohal/pugixml

Upgrade the bundled pugixml to 1.5
Implement selectable scaled vector chart symbol rendering.
Correct occasional error in Lights, Text, and Soundings toggle for vector charts.
Eliminate a variety of small shutdown and runtime memory leaks.
Correct a small but persistent memory leak in OCPNRegion dtor.
Improve AIS Target Query dialog layout & colour.
Merge pull request #209 from seandepagnier/master

Correct broken rotated or course up display in single chart DC mode.
Remove F9 quilt mode toggle key in favor of "Q" key.
Correct OpenGL display parameters on overzoom emphasis.
Correct a possible crash in main GRIB dialog right click menu
Handle the case of plugin library without read permissions properly
Refine the AIS target track persistency implementation to allow saving the track for as long as the user decides.