[UI] On dashboard, replace "last 15 messages" with "statistics"

[kbond]

I'm thinking this would be more valuable but what does everyone else think?

[SpartakusMd]

Personally, I use more the history than statistics, but both are one click away :)

Still I believe it's useful to have it on the dashboard instead. I see a couple of improvement points there that would give more sense to have it there:

• Some general charts, like messages processed for each hour, day (configurable the duration and interval), number of failed messages
• Sorting in the table, I want to know which type of message was processed most of the time
• Mini graphs for each type of message
  • the dynamic for number of messages processed for each hour, day (configurable the duration and interval)
  • Average Handling Time for each hour, day (configurable the duration and interval)