Rework NodeStatus to be more flexible
Load input tables from configuration file

You can now specify multiple input tables in configuration file, using the form :
material_signature = input_file

This intent to reduce computing time of easy but huge oracle (such as KRkr, KNkn, etc),
and eventually re-use precomputed oracles.
These tables will not be written, only read.
Add header to tables
Fix "threshold"