importing exported Tracker objects, and to fix bug with
handling '/' characters.  Also did major cleanup by
separating "put" handling into a separate function and
changing sequence pickle jandling to use 'string.join'.

traverse() method.

filtered by permission in the filtered add list.

Without this change acquisition of REQUEST is disallowed, which
penalizes access in DTML with tags.

from 2.2 branch

Made restrictedTraverse public.

Changed logic for restricted traverse (which actually lives in
unrestrictedTraverse) to:

  - Check access for root when absolute path is used.

  - Call getSecurityManager just once.

the "Access Contents Information" permission from being effective in
the root object.

of DateTime object) from 2.2 branch.

Removed registration code for permissions found in classes, since
these are handled by default class init.

registry.