release 2020-04 follow-up #874

Release date: Q3 2020 (late october)

Expected:

• Qt5-5.15.1 & Spyder on Python-3.9
• nodejs-14 (LTS starting october-27th)
• PyQt5-tools are included (QtDesigner, ...)

Postponed:

• Jupyterlab-3 (no rebuilt when adding a plugin, but more than 1 month late)
• pip-0.20.3 strict resolver

Focus:

• the Jupyterlab-3 transition,
• pip-0.20.3 resolver will become strict.... so beware spyder-4.2.1 only will be PyQt5-5.15.1 officialy ready.
• improve pandas multi-core : dask, modin (lagging on pyarrow<=0.16 ), vaex (tf), ray-project (complex, alpha Windows support)
• improve web Client technologies support: wasm, typescript, ...
• a pyside2 branch, as qtdesigner is included
• keep size in check (<750Mo)
  • removing nodejs seems possible with Jupyterlab-3: 20 Mo (but just not building may bring a "+")