Bug fixes

1. Prevent QGIS from crashing when a layer that is added to the profile tool is removed from QGIS layers. That layer is now automatically removed from profile tool when a new profile is drawn.
2. When using Matplotlib on Windows the save buttons are hidden by the Matplotlib buttons. This fix shifts them to the right where they are visible. I could not check how it looks on other systems or with Qwt5.