Loader - report on new and existing lines when loading children

[nicolasdemauroy]

There should be an option when doing a loading children to have a confirm page showing the lines added or modified before the loading. This would help users detect that they are in the process of creating duplicates because of an error in ID.

It should show:

• a summary of number of lines added / modified and total number of lines
• all lines added or modified or existing untouched, ordered by name.

This makes sense only if:

• loader allows NR to be created
• the objects have name