Merged changes from reskontr.
Show data in measurement fields.
Use combo boxes for patient choice.
Update measurement dates after changing patient.
Update measurements when changing the date.
Keep graph controls initially disabled.
Use layouts for UI.
Make study buttons exclusive toggles.
Added margins to graph.
Fixed crosshair limits.
Fixed plotting normative data.
Fixed regression plotting.
Added regression equation.
Fixed tab order.
Show patient info.
Clear patient info.
Possible to change x-axis variable.
Enable log radio buttons based on settings.
Remove regression lines.
Destroy the plotter when changing measurements.