Recipes can be learned from books now
Add a craftable item mod that doubles battery capacity of tools

You can learn the "extra battery mod" recipe from "What is a Transistor?" and "Advanced Electronics". Requires Electronics 3+ to learn.
Addictions can be configured in professions.json
Fixed bug in construction menu
Make foods in containers use their own age to show rotteness, not
the age of the containter. Fixes #491
Attempt at making the construction menu more readable.
See issue #462
SIGN OFF
Dissarming a crossbow trap will drop crossbow bolts.
Triggering crossbow traps now gives only one bolt.
map::spawn_item() will now correctly set charges for single objects.
Disarmed crossbow traps now only drop one bolt
Encumberance decriptions now determine the correct sign using the '+' tag.
Make scooters spawn with small wheels. Closes #497
Add ammo flag indicating which ammo types explode when burned and apply to appropriate items.
Base ammo explosions on new cookoff and other flags instead of item identity.
Cook off a random number of rounds each turn when ammo is in a fire instead of all of them at once.
Updated changelog.
Add ability to learn recipes from books, and an extra battery mod for tools that uses it for its construction recipe.
Added a priority function to list items
Merge remote-tracking branch 'base/master'
Addictions can be configured in professions.json and move addiction mechanics to dedicated module.