remove DeltaVision-specific constant from pixels service
create new disk usage request
implement new disk usage request
make new request callable

(add thumbnail service into request object factory registry)
adjust API of disk usage request
adjust disk usage implementation to match API change
Use Hammer.js for Image-viewer panning on mobile devices
Include hammer.js and viewport.css in base_container.html
Adding Zoom buttons to top-left corner of viewport (same as PanoJs)
Always use the global min and max for start and end by default.
Set pixels range for 32-bit.
Add 32-bit support.
Remove duplicated code.
Do not build LUT for 32-bit images.
Remove whitespace.
Review mapping and store mapped values.
flake8: main integration tests - ishare
flake8: main integration tests - itimeline
flake8: main integration tests - itypes
flake8: main integration tests - iupdate