Quentin 26/03/2021: Major update of KTEST : add python for all KTEST based on...

Quentin 26/03/2021: Major update of KTEST : add python for all KTEST based on src/LIB/Python scripts + remove diaprog and conv2dia steps +
add DIAG steps for needed Python plots variables (ISOAL variables)
+ update existing ncl script to re-arrange dimensions of backup files
+ remove ncl script of time series KTEST (ncl not supported soon)
+ adapt Makefiles