metadata update and minor update of info text for stratigraphy import
	modified:   metadata.txt
	modified:   midvatten.py
drillings without stratigraphy data is now included in section plot
	modified:   sectionplot.py
sectionplot: fix to force autoscale of xaxis when only obsid annotation
	modified:   sectionplot.py
sectionplot: inactivating controls for features that are not yet implemented
	deleted:    secplotdialog_ui.py
	deleted:    secplotdialog_ui.ui
	modified:   secplotdockwidget_ui.py
	modified:   secplotdockwidget_ui.ui