Resolve "Add a node to see sources content"
- Add the node sources in the main viewport
- Remove obsolete tables
graphs,lists,metrics1d,metrics2D - Remove obsolete scripts
run,migration_list_070,migration_metric2d_070 - Add the class
Source - Add 3 tables for selector
selecto_list,selector_metric2dandselector_source - Add the methods
Event.get_sourceandEvent.get_srouces - Closes #26 (closed)