Change Debian install PREFIX to /usr
Add recursion safeties to chart database access.
3.3.1418
Updates to PlugIn chart interface, especially S57 extended sectors and NATSUR attributes display.
Correct OSX Info.plist format rules.
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into mainline

Conflicts:
	CMakeLists.txt
	VERSION.cmake
	include/chartdb.h
	include/ocpn_plugin.h
	include/s52plib.h
	include/s57chart.h
	src/Quilt.cpp
	src/chart1.cpp
	src/chartdb.cpp
	src/chcanv.cpp
	src/pluginmanager.cpp
	src/s52plib.cpp
	src/s57chart.cpp