Allow to skip reloading the dashboard on each filter

[Pierstoval]

When one filters anything on the dashboard, it reloads automatically.

It's a cool feature, but when the app is very big and/or the server is not powerful enough, the request can be very long (as said in #108 , it can take up to 10 seconds just to remove one "status" from the list).

It could be good to keep this behavior but to add one checkbox "Reload on each filter" checked by default, and when not checked, we would need to click on an "update" button to reload the dashboard with the actual filters.

As there are many links on the different filters, I hope it would not need too much refactoring to handle this 😕

This would help a lot as a workaround for #108.