(feat/user page) Added a new factory to include all dates of both users.

1) This new factory will include the dates of the second user if the first user didn't have those dates. It also sorts all the date to make it in order. This was necessary to compare series in the multi bar chart. If the dates are not there in the first user, the bar chart will push the bar of the second user to the end of the graph and the dates will be all messed up.