anchor.diff:  rem 2020-09-27 Jupyterlab-3 5S (looking for missing detail) 
   rem 2020-10-25no_more_needed "nbextension enable" no more needed for bqplot, ipyleaflet, ipympl
   rem 2021-01-30: jupyterlab2 final stuff removal
  +rem 2021-03-13: notebook classic stuff removal
   
   
   rem if build error, launch "WinPython Command Prompt.exe" dos ico, then try manual install of requirements.txt 
  -rem that is:  pip install --pre  --no-index --trusted-host=None --find-links=C:\WinP\packages.srcreq -c C:\WinP\constraints.txt -r   c:\....\requirements.txt 
  +rem that is:  pip install --pre  --no-index --trusted-host=None --find-links=C:\WinP\packages.srcreq -c C:\WinP\constraints.txt -r   C:\WinP\bd39\requirements_test.txt Qt5_requirements64.txt Cod_requirements64.txt
  +rem python -m pip freeze>C:\WinP\bd39\req_test150.txt between intermediate steps
  +rem 
   rem           ( drag & drop "requirements.txt" file in the dos window a the end of the line, to get full path)
   rem then drag & drop "run_complement_newbuild.bat" file in the dos window and launch it
   
  
positive.code: echo clear jupyterlab staging (2018-03-09)
  rem * ===================
  if exist "%WINPYDIR%\share\jupyter\lab\staging" rmdir /S /Q "%WINPYDIR%\share\jupyter\lab\staging"
  
  
  rem * ===================
  echo clear Pyside2 QML (2018-04-29 : it's too big)
  rem * ===================
  rem 20181222
  rem if exist  "%WINPYDIR%\Lib\site-packages\PySide2\qml"  rmdir /S /Q "%WINPYDIR%\Lib\site-packages\PySide2\qml"
  
  @echo on
  
  echo 2019-10-22 Spyder tweaks moved at the end as suspicion of problem creating (on Python-3.8)
  rem * ============================
  
negative.code: if not exist "%WINPYDIR%\Lib\site-packages\mingwpy" echo [config]>%pydistutils_cfg%
  
  
  rem * ==================
  echo finish install of bqplot (for VSCode 2021-03-13)
  rem * =================
  if exist  "%WINPYDIR%\Lib\site-packages\bqplot" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py --sys-prefix bqplot
  
  						 
  rem * ==================
  echo finish install of nteract_on_jupyter (2018-12-27)
  rem * ================= 
  