Cleanup the copystaticdocsplusinsert python code.
Cleanup the copystaticdocsplusinsert python code.

* Systematically use os.path.join for joining paths.
* Use os.EX_ exit values.
* Added some documentation for functions.
* Fixed spacing.
* Use `fronzenset` for immutable collection.
* Avoid uncessary variable in the root namespace.

schemaorg/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg