[LRC] Add finer date and time related roles to calls
Issue generated from Tuleap's migration script. Originally submitted by: Emmanuel Lepage Vallee (elv13)
I made a new proxy model that deduplicate/merge QModelIndex when a role is identical. So I used the displayname, but for categories like "last year", it is strange to see 2 calls from 2 different months being merged. So I need to add a second role for "do not merge if the day is different" but LRC have no such role
I also noticed formattedDate could be better cached as it is called quite a lot be the view