major changes to midvatten settings
	modified:   customplot.py
	modified:   definitions/midvatten_defs.py
	new file:   icons/Piper.png
	modified:   metadata.txt
	modified:   midvatten.py
	modified:   midvsettings.py
	modified:   midvsettingsdialog.py
	modified:   resources.py
	modified:   resources.qrc
	modified:   sectionplot.py
	new file:   ui/midvsettingsdock.ui
settings bug fixes
	modified:   midvatten.py
	modified:   midvsettings.py
	modified:   midvsettingsdialog.py