Merge pull request #123 from markhuberty/patstat

Add patent example and related functionality to the dev branch
some tweaks to run patent example
beginning splitting of forest and marks contributions to dev
remove stub of canonicalization
fixed test
updated dev branch
Merge branch 'forest_dev' into dev
Revert "remove stub of canonicalization"

This reverts commit 3ace647b493e251e42e60b8a90dc7ac7acf64d0c.
Revert "beginning splitting of forest and marks contributions to dev"

This reverts commit 0b108c82a67de82021e9d1fc0e07d2fee949fb12.
factor out AsciiDammit
removed Levenshtein dependency
factor out canonicalization.py from dev branch
removed some helper functions that we already have in core
removed some unnecessary libraries
moved blocking predicates updates
factored out comparator definition