The filter argument must be a function that takes a TarInfo
object argument, changes it and returns it again. If the
function returns None the TarInfo object will be excluded
from the archive.
The exclude argument is deprecated from now on, because it
does something similar but is not as flexible.
keyword arguments and the actual default values.
Fix references that point nowhere or to the wrong place.
Add description of the ENCODING module-level variable.
Fix the URL pointing to the GNU tar manual.
Remove two obsolete examples.
Add an example on how to use a generator with TarFile.extractall().
