No skill should go from 4 to 7 by crafting a single object, right? [balance]

# Is your feature request related to a problem? Please describe.
I just crafted a programmable autopilot and with this single task my character went from Computers 4 something to Computer 7. This looks OP.

# Describe the solution you'd like
A more balanced skill gain?! IMO, no single task should raise your skill by more than one level, don't you think?

# Additional context
Last version before nested inventory.

- OS: Linux
- OS Version: LSB Version: core-9.20170808ubuntu1-noarch:printing-9.20170808ubuntu1-noarch:security-9.20170808ubuntu1-noarch; Distributor ID: Ubuntu; Description: Ubuntu 18.04.4 LTS; Release: 18.04; Codename: bionic;
- Game Version: 0.E-1477-g8cea0fc [64-bit]
- Graphics Version: Tiles
- Game Language: English [en]
- Mods loaded: [
Dark Days Ahead [dda],
Disable NPC Needs [no_npc_food],
Stats Through Skills [StatsThroughSkills],
Alternative Map Key [alt_map_key],
No Fungal Monsters [No_Fungi]
]

No source file, test, or entry point is named. Reproduce crafting a programmable autopilot with the listed game version and mods, then trace the Computers skill gain; done means one crafting task cannot raise the skill by more than one level and the behavior is covered by a regression test.

Written by the indexing model from the issue text.