climate-processes/tobac: tobac 1.2

Version 1.2 of tobac Changes:

• Improvement of multi-threshold feature detection by removing processing time bottlenecks and modularisation into several subfunctions
• Improvement of segmentation by removing of processing time bottlenecks and modularisation into several subfunctions, fix of errors due to inconsistencies between the use of dask and numpy arrays
• Speedup of helper function add_coordinates
• Some additions and fixes to the documentation

All these changes simply improve the performance of the analysis, but do not change the analysis results.