Little patch

Hello pool cleaners ;)
we fixed a couple of bugs like:
-visual bug with completed mission School Pool part 2
-problem with placing chairs in Oceanarium level
-problem with unpacking in tutorial stage
-heater on murder pools now will work (it was always working, there weren't any temperatury to changem, now you need to adjust the temp a little)
-other smaller bugs

Please let us know if there are still some problems.