gui: fix rounding error display of HFW

for now we need to explicitely ask for sig=3 even after rounding
gui: change default views for analysis tab

bottom right shows everything, bottom left, only AR
also ensure that type of streams are displayed on the right part when loading example
acquisition: display the streams after acquisition

introduce new .getStatic() method on streams, to get an equivalent StaticStream from any stream.
Then it's easy to generate the streams for the views.

also fix a bug in the way the center of the ROI was converted to the translation