("make smelly" now clean)

failed, second invocation of close() and destructor no more raise an
exception.

Initial wording proposed by John Roth.

Closes #19179: make table of XML vulnerabilities clearer by using "everyday" booleans and explaining the table beforehand.

compressed streams.

compressed streams.

interpreter startup. stat_result and statvfs_result are now hard-coded to
reside in the os module.
The patch is based on Victor Stinner's patch.