* scrapQL: Quality of the wood scrap used for the improve action
* fenceQL: Quality if the fence before improving
* skill: Carpentry skill. At low skill the effective skill appears to be 1.36 * real skill (tested on test with 4-8 carpentry skill)
* maxQL: best Quality you can ever reach with the skill and the specific wood scrap
* inc: best increment possible with the skill and the specific wood scrap
* Exact scrap QL: 1.576906 (determined from creating 3 unfinished fences)
* Exact skill 81.510471-81.522926
The determined error for the maxQL was less than precision of the reported carpentry skill.
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