gui: unfixed a bug, because it might cause threading problems and crashes
Merge branch 'master' of delmic-server.local:odemis
gui: remove unused function

looking at tab_data_model.views.value would be in general better
Merge branch 'master' of vpn.delmic.com:odemis
gui: ensure that analysis tab of sparc can display any kind of acquisition

make sure that optical streams can be seen too

In the long term, the views should adapt to the current acquisition file.
hdf5: use states to record which metadata is actually correct

skip the invalid metadata when reading back

especially useful to read SEM data, which should not have excitation/emission wavelength