Fix vty frontend and add vty and curses tests to travis
Fix a crash when a projectile hits a wall

and it is the only actor of a spawner faction left on the level at the time. :)
Rework cabal flags to force compilation of curses

desipite cabal smartly turning on -fvty, because curses deps
are not satisfied.
Fix compilation of the curses frontend
Bump version for the 0.2.10.6 bugfix release
Force flags in deps installation as well, for travis