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Merge branch 'master' into develop
Write related work, installation and usage sections
Write implementation details
Improve layout
Improve first sections
Improve LowerUnits and LowerUnivalents
Improve algorithm descriptions
Change wording of pebbling is PSPACE-complete
Add TraceCheck description
Improve  description of trace-check format
Improve minor things
Remove line
Fix typo
Describe Skeptik proof format

The sample proof is still false.
Improve description of Skeptik’s proof format
Correct error in TraceCheck proof example
Correct error in Skeptik proof example
Improve title
Remove copy-pasted experimental section