1. Optimize hirarchy display, use jQuery 2. Delete most icons files, use icons from CSS instead 3. Better range selection in logx/logy scale 4. Handle situation when CORS blocks access to request headers

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>
Add icons in JSRootPainter.css file

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>
From Pere and me: Add several missing /include directives (Force Symbol References)

Without these flags, python is not working properly in interactive mode (i.e. GUI is frozen)
More on dependencies and using different files for the python tutorials
Merge branch 'v5-34-00-patches' of https://github.com/root-mirror/root.git
[cmake] Added numerous new build options.