Slitasje edits alk

[anders-kolstad]

Updating chapter following review by @marianneevju

• Hopefully better explaind workflow, in plain text #94 #93 #92 #91
• Updated figures and figure captions #106 #105 #104 #102 #99
• Fixed threshold value to be 10% rather than 5% #37
• Gone from one-out all-out approach to an additive approach
• Changed the rules from going from the ordinal scale to continous data #100
• Other bugs and small edits #103, #98 #97 #95

[anders-kolstad]

I'll pass this myself as it's mostly minor things