AI reads scroll of blinking, but throws scroll of teleport
Invalidate target path if fast monster moved before vanishing
Cosmetic changes to content and docs
Shorten the long test to make travis happy
Add a weapon sharpener tool
Have per-level spawning frequencies
Roll items from all groups at once, with weights
Spawn actors from all groups at once, with weights
Place arena-type corridors around dark rooms on arena levels
Refactor actor spawning vs actor recruitment
Specify per-depth rarities of places
Add hornet swarm and tweak other contents a bit
Summon actors from specific groups, not factions
Describe monsters according to the categories==madness theme
Give the magical items mathemagical flavour
Describe actor (including projectiles) when looking at a tile

This is a temporary measure, until actors are listed and described
in ohter ways.
Don't let blind actors read scrolls
Don't path through doors if the actor can't open them
Add game mode descriptions
Display game mode description at game start