Terrain_signal_handler may now receive a bonus depending on the Terrain_flags from the terrain the user is standing on.  Used to implement locked doors that can be opened from inside.
Add "sealed" Terrain_flag; prevents the player from seeing or picking up its contents.  Added a safe as an example.  It spawns on the beach!
Merge pull request #27 from Aninimouse/master

New Houses
Fix line endings in house_aninimouse.map
Tell the player if a Tile's signal handler has a 0% chance of success.  Set safes to be un-pry-able unless the player's strength is >= 16.
Add a safe to pharmacies; lots of hard drugs inside.
Add protection value to Item_type_clothing; environmental protection (e.g. face mask protect against gas).
Fix incorrect error-catching debugmsg
Renamed "closed locked door" to "locked door" (an open locked door isn't locked...).
Rename "closed locked door" in beach.map
Add a bunch of new items for hardware stores.  Add two new hardware store layouts, and improve the existing one.
Merge remote-tracking branch 'cataclysm2a/master'