gui: Text controls with units now correctly reflect the si formatting when editting (i.e. 10.5 ms becomes 10.5e-3)
acq find overlay: small cleanup/improvements

don't completely fail if the pixel size is not available for transformMetadata

directly create the files of the overlay report at the right place... and make it more likely that
this place is writable.
Merge branch 'master' of vpn.delmic.com:odemis