OpenACS

- removal of forums_reading_info_user (1Mio rows on Learn@WU).

 This materialized view had to be constantly synced with

 forums_reading_info table. Reimplemented as view.

- simplify logics in stored procedure due to new datamodel

- fix inconsistencies between oracle and postgres function definition

- re-enabled parameter to decide whether use these stats or not in

 administration

TODO: consider further reform of this feature as stats grow very

     large on busy sites for probably little value added

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