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_metric2d
andselector_source
- Add the methods
Event.get_source
andEvent.get_srouces
- Closes #26 (closed)