Keep leader unchanged when using stairs, except for the initiator
Don't clog stairs via Domination
Make heroes fighting against spawners less aggresive
Merge the hero teams in defense mode

Until alliances share map info, if ever, they are at disadvantage
wrt a single party, even though they have less leaders.
Plus this is closer to the reversed campaign mode
and the Coop mode tests alliances enough.
Reduct the framerate of the frontend* tests
If can't flee, at least hit
Be more aggresive when friends attacked
Use stairs more bravely
Tweak AI for weak and alone actors
Don't let AI be afraid of actors with low HP
Randomize AI eps parameter (paths and lines)

This let's us avoid loops as in

                             O...............O..O......
                    .....O-----.O.OO1....----..........
                    ......-   -..........-..|..........
                    ......-----..O.....O.|..|O......O..
                    .............OO....2O----O.........

                             O.......1.......O..O......
                    .....O-----.O.OO.....----..........
                    ......-   -..........-..|..........
                    ......-----..O.....O2|..|O......O..
                    .............OO.....O----O.........

where the '2' actor flees between two tiles and the '1' actor
picks one of the optimal paths, starting with a NE move.
Fix throwing unidentified items
Separate AI threat and victim conditions
Tweak actor list functions for non-projectiles to exclude dying actors