tiff: improvement on OME-TIFF export

scale and position of the thumbnail
microsocope and detector metadata

group by detector type
conversion: fix wave2rgb when wl is between 350 and 380

probably was a typo
gui: fix update of stream colour when changing wavelength

was listening to wrong event. Our TxtCtrl generate COMMAND_ENTER on new value.

Also fix step with up/down keys on Integer text controls
tiff: fix wavelength export
backend: rename MD_OPT_MAG to MD_LENS_MAG and make sure this metadata is updated
Added an event object (i.e. a reference to 'self') to the Slider event generator
Merge branch 'master' of delmic-server.local:odemis
odemisd: update also the input wavelenght metadata
hdf5: introduction

works very slightly
hdf5: basic export working

ensure the shape of the image follows the recommendation of SVI (5 dimensions)
ensure that image has a fixed string length attributes, so that it's correctly recognised as an image
basic metadata support

add test cases
Merge branch 'master' of vpn.delmic.com:odemis