woarking on dem in section plot
	modified:   definitions/midvatten_defs.py
	modified:   sectionplot.py
	new file:   tools/__init__.py
	new file:   tools/sampledem.py
	new file:   tools/sec_tools.py
	modified:   ui/secplotdockwidget_ui.ui
working on DEM in section plot
	modified:   definitions/midvatten_defs.py
	deleted:    sampledem.py
	modified:   sectionplot.py
	modified:   tools/sampledem.py
	modified:   ui/secplotdockwidget_ui.ui