cuav_region: added draw_rectangle() API

used to highlight regions in images
mosaic: show rectanges around found regions in image view

this makes it much easier to find the regions
geosearch: change window title in image view to include image name
geosearch: added title to options dialog
scanner: make scanner thread safe

scan_params can vary between calls. Ensure it is on the stack
cuav_region: calculate compactness from low level scoring
cuav_mosaic: added auto_size to Mosaic window
Use Pyscanner: fixed score array filling

use PyArray_GETPTR2
scanner: added region merging

merge overlapping regions before pruning