Improve setting of roi

[TonioF]

From MULTIPLY UI-Review:
Users have requested that, along with the map, the coordinates of the region of interest shall be displayed. In particular, it shall be possible to paste in a WKT string which is then displayed on the map. Finally, there was arequest to enable the upload of a shapefile that defines the roi.

• Show ROI coordinates
• Set ROI from WKT string
• Set ROI from shapefile