Correct a possibility to get a crash
Fix usage of default track line width setting
Add Loop start option (#FS1240)
Barometic pressure; -hpa to hPa, limit scaling to 930-1100. Also move the base line to 18 from 27.
Merge pull request #92 from stedy6/master

Barometic pressure, hpa to hPa, limit scaling to 930-1100. base line to 18 from 27.
Merge pull request #93 from Ptizef/master

Divers improvements
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into mainline

Conflicts:
	src/navutil.cpp