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improve spelling

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Chat Reform: reduce complexity by removing the 'chat_avatar_allow' privilege, 'chat_room_edit' should suffice.

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Major reform in the chat backend: use xotcl-core ORM to define all the relevant objects and data model

This greatly converges oracle and postgres codebase and will make easier to apply incremental updates to the data model in the future. It will also automatically update the acs_object_type metadata automatically

TODO: remove legacy procs, temporarly reimplemented using the new backend

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Chat data-model reform:

- introduce on delete cascade on foreign key constraints so package can be removed easily e.g. from the subsite UI

- remove remaining stored procedures (and function_args definitions) to relieve the burden on the development process and reduce divergency between oracle and postgres code

- converge oracle and postgres datamodels:

. oracle -> add missing messages_time_window column

. postgres -> remove creation_date from chat_transcripts, which was found to be still existing on old downstream installations

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Whitespace changes

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Chat Redesign: enable/disable avatar pictures by room, using the new attribute 'avatar_p', instead of by package instance, using the 'ShowAvatar' parameter.

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merged changes from the oacs-5-9 branch and resolved conflicts

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Allow user to specify how far in the past people connecting to the chat will see.

This is important on Learn@WU because people joining the chat room later want to

see the full conversation and before this was not settable from the UI. (Now defaults

to 4 hours) Useful also when somebody accidentally refreshes the chat after the

timewindow has passed.

Took this chance to ease a bit every future development: removed stored procedures

slowing greatly any change on the data model in favor of plain sql statements.

Incremented usage of cache.

Removed duplicated database operation when managing transcripts.

Fixed transcript name not being shown when deleting.

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- modernize SQL

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Rolled back HEAD to the version on the 5.3 branch

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reverting pablom's commits to oacs-5-2: see http://openacs.org/forums/message-view?message_id=1042586

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"New version of the package"

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Improvements in order to increase the funcionalities, overall in the creation and using of chat rooms

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Valencia chat package. Provides support for postgresql and few enhancements like user search.

  1. … 90 more files in changeset.