Added periodically and do-periodically.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2015-07-20 00:17:33
Author local date 2015-07-20 02:17:33 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2015-07-20 00:17:33
Committer local date 2015-07-20 02:17:33 +0200
Commit bb415d18eb3dbe94bb8c88ab84f856f846b782dd
Tree ab233968cc89d873d1d971a66ffa50256712af7b
Parent 2bf90f287424174b876487974cde2d720b84bca9
Added periodically and do-periodically.
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