On servers updating when all data successfully gathered we're now
properly updating rows in Servers and Favorites lists.
Increased "simultaneous ping limit" for now, but anyway it provides
too bad results. Need to find a way to fix it.
Now we have pooler which will pool connections (like pinging),
so there will be no timeouts due to "we have launched 100000 goroutines".
Reworked all code to use events (see Eventer). Still more work about
this to go.
Maybe more fixes I forgot.
