Correct logfile max size.
Fix msgfmt (from gettext) warning: header field 'Language' still has the initial default value
Fix compiler warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
Add Intl Dateline correction for skew analysis when appropriate.
Merge branch 'master' of https://github.com/Ptizef/OpenCPN into Ptizef-master
Fix an assert and subsequent crash on Mac OSX with wxWidgets 3.1

  We should always use %zu for size_t printf
Initial implementation of PlugIn API 1.11
Merge branch 's63'
Improve PlugIn API 1.11
Correct for improperly coded PP parameter in some BSB charts (FS#1251)
Correct PlugIn load location.
Finish nicely on SIGTERM, for example on system shutdown