Index projection option V1

Currently the index always compute the index lines by projecting matches ​​onto the properties values -> this is the "projection" mode

If this option is disabled, then the query matches should be regroup into only one Index line. Thus its name would'nt be the concatenation of the properties values but simply the query (or its name)

note: a V2 version could set the projection option by query instead of a global option (for the current index)

note: this option should replace the QueryIndex test command

UI

Add a new Check button to activate the projection (default : true)

Recette

1. Create an Index on VOEUX
2. Set the "j.+" query
3. Compute with "projection=true
4. The results contains lines like "jamais, ..., "je", etc.
5. Set "projection=false
6. Compute again
7. The result now contains only the "j.+" line

Hyperlink: when projection=true, the behavior is the same. When projection=false, the linked concordance is no more a child result (but a sibling) and the query is exactly the query of the selected line.