[Input_filter node] integrate the filtering as a completion implementation for the input filter node

[servoz]

In fact, the main task of the Input_filter is to perform a specific completion of the output (what we call a filter :-).

• We want this to be able to be done within the existing completion. We also want the i/0 indexing in the database to be done after completion for each brick rather than at the end of the pipeline initialisation as now.

• By inserting this into the changes to be made to the development of a temporary database during initialisation stage #249 , we would have a mechanism for the Input_filter brick that would work in all cases.

*For more details, please see #243

[servoz]

Indexing of i/0 in the database is now performed after completion of each brick, rather than at the end of pipeline initialization. Can we close this old ticket (I'm not sure that integrating the input_filter into completion is very important)?