Orbit 2.52 with multichannel + Omero 5.3.x support

Today we release Orbit version 2.52 (for Omero 5.2.x) and Orbit 2.53 (for Omero 5.3.x).

Both versions are identical except support for different Omero major versions and support multichannel / fluorescence images with unlimited number of channels. In addition, this version provides many bugfixes and speed improvements. Multi series / scenes can be selected in the file open dialog. Gamma/contrast works properly now. Scalebar should work for most filetypes. Makes use of the new Bioformats 5.4.0. Please upgrade now!