Savannah update delays

Many functions on the Savannah web site affect data outside Savane database. This includes functions related to mailing list management, VCS repository creation, updating web pages, etc. When the updates to those systems are made in cron jobs, the changes will not take effect until the next cron update.

In particular,

Group and account-related public info, member access control, email addresses, notification settings, GnuPG and SSH keys are in effect with no delay.
Mailing list-related requests (creation, password reset, configuration) are processed on lists.gnu.org immediately.
Group home pages update within a few minutes.
Updated email addresses of user accounts arrive at VCS servers every 10 minutes.
New repositories are created twice an hour (when the VCS is enabled on the 'Select features' page.)
ViewCVS never recomputes the \~4000 group list (it would consume too much resources and time to do it at each request) - but Apache2 (hence ViewCVS) is restarted daily by sysklogd. So new repositories are taken into account by ViewCVS only every 24h.

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