- PanelPlot: add legendSize for XY_lines
- missing Ticks label handlers
- bug : get_data_only was always True and did not work : missing value to NaN converted the data to masked_array

change in names of parameters :
- vectors: change Lcbarlabel to Llegendlabel + change in all KTEST namelists of the PACK

Quentin 06/07/2021: update Python lib to read NetCDF4 groups and adapt KTEST to the new read functions + cleaning

Quentin 06/05/2021: Python lib update. Add AVION and AVIONZ time series; correction of reading from netcdf group;
read MASK variables; improve date printing; add colorbar formatlabel; remove contour label (to debug); add streamline plot

Quentin 16/04/2021: adapt visu python KTEST to display command instead of (convert + evince) for portability

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