gui test: Bug fixes
gui: Added PointsOverlay test case and tweaked pointed representation
tiff: save dwell time metadata directly as "exposure time"

it's better to save the raw data, and consider it as "integration time" than doing assumptions and expecting
the user to divide that time by the amount of pixels. Anyway, the total time is even longer, as there is settle time to take into account.
gui util img: clean up

no behaviour changes
Merge branch 'master' of delmic-server.local:odemis
gui: inverse the Y axis of the SPARC AR

The convention is to have the Y axis to the top, which means in manual
alignment mode, which has no lens, it should look toward down. IOW, we want
the bar of the D on the top in normal acquisition, so it should be down on the
alignment.

Still needs to be tested on the real hardware to check everything has been correctly
inverted.
Merge branch 'master' of vpn.delmic.com:odemis