Segmentation overay

[lullulalal]

exact-browser-sync.js

• Display the segmentation images list.
• Split the segmentation overlay and registration handlers.

exact-overlay-opacity.js

• Event handlers related to the segmentation overlay.

annotate.html

• Include the newly added exact-overlay-opacity.js file.

model.py

• Modify to allow uploading .hdf5 files.

requirements.txt

• Add the h5py package
• Update Django version. In the latest version of Django, no errors occur with CharFields.

[maubreville]

Hey @lullulalal. Thanks for the contributions. I think we need to briefly discuss the architectural change here, since it changes the way EXACT handles files.
Maybe we can nicely merge this with other efforts that also changed how EXACT handles files provided by my recent PR (#109).

Some questions from the top of my head:

• Is hdf5 the right file format for masks, as it is very general-purpose? Shouldn't we go for something that is more in the direction of sparse matrices?
• Additionally, HDF5 might be too general and might yield to complications if people use the internal file structure differently.

Regardless, I think the handler for segmentation masks could ne neatly integrated into the new getSlideHandler() mechanism.

@FraukeWilm: Since I think you are also involved: Could we briefly meet to discuss this?