Start a new development version 0.4.11
Rename floor groups and tweak combat arena
Fix test

in the case of a monster killed in the first turn.
Then sending a '.' is not enough, because the messages
have to be cleared with a ' ' first.
Modify dungeon generation content according to engine changes
Add trees
Tweak content to let caves and fences be dark or lit
Enable dark and lit paths
Relax the constraint on package text
Move non-data files to extra-source-files
Add changelog
Don't create secret doors if paths determine the door positions
Simplify skirmish arenas by creating items only inside rooms
Rename rock-related features
Fix no room doors in the empty cave
Rename 'cofact' to 'cofaction'
Don't generate gold in the combat arena
Fix travis via switching to enummapset-th
Prepare version 0.4.10.5
Show the last lines of test games output
Use rocks, not walls, for the combat arena