Updates w.r.t. archdef.conf in the context to ecearth3:

- rebuild tool updated from rebuild_nemo-r3309 to rebuild_nemo-ece3
- upgraded cdftools from version 2.1 to 3.0 (essential for ecearht3-spin templates)
- in connection to ecearth3 apart from sim type of jobs (for other kind of templates like ini, post, clean and a few pre-sim steps) the tools like netcdf, hdfd5 and szip would be used as with which model has been compiled
- while cdo and nco versions would have been chosen on the base of what has been made available at each platform by support team either under modular environment or without that.