2016-10-04: v. 0.5.1.7

Changes to upgradeable weapon kits. There is a problem with the way, weapon kits are upgraded. Sometimes those weapons disappear due to the way they are made.
So I changed the way those kits are made, trying to make it compatible with existing saves.

What you need to do:
Exchange the base weapon by combining it with the crafter statue. Requires neither Crafting nor Blacksmithing.
After you exchanged the weapon once, you will have no further steps to do. ... hopefully ;-)

Exchanging weapons should not be required in new games, but best save before combining. Report if some things don't work.

Additional changes:
- reduced the requirement for splitting large iron and steel bars from Blacksmithing 2 to 1
- fought my laziness and added Painful Distraction scroll and skillbook crafting recipes (requirement Crafting 4)