Disable browser archiving and process reports every X (X less than 1 hour) will fail #1362

By default, the documentation recommends to set an hourly crontab.

If users disable browser archiving and then set to 'process reports every eg. 100 seconds' this will fail as the crontab only runs every hour. In this case, when X < 3600, we should display a warning message explaining the possible clash, and inviting users to update the crontab.

(In [2640]) Fixes #1362 Adding message in bold in the inline help box when the case is happening, warning users