A few small changes in reports.
thelmuth/report-lexicase
Fixed zipper use in util
Changed all seq-zip to non-bugged version.
Merge branch 'master' into fix-simplification
Merge branch 'master' into wc-from-domains
thelmuth/fix-simplification
Print 'Zero cases best number of zero cases'.
Removed reliance on walk in many places, with zipper-based prewalkseq.
Merge branch 'master' into wc-from-domains