[0.50][bug]Bugs and a crash

Crash:

I was just trying out the new diplomacy beta and after a while the game simply crashed with "a pure virtual function call" when clicking the turn button.

Bugs:

- Text on event (both galactic and planetary) doesn't always fit in the allotted area which means it's unreadable since there isn't a scrollbar either.

- Production seems to stall on my planets. None of the structures on my planets seem to show any progress in their construction. This was going on for at least 5 turns, probably more before the crash happened. Note that I could still rush the construction.

- Should the "production speedup" survey reward be applied to a planet which is running one of the infinite items (research project)? Seems a bit odd.

- When a ship is guarding a planet the tool tip shows a large negative number (maximum negative 32 bit integer) "guarding the planet".

- Galactic events seem to be a bit repetitive. I got the same event 5 times in a row before I ever saw another, which in turn I got 3 times in a row.