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merge with missing files

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merge from oacs-5-10

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Improved SQL query significantly by using "acs_permission.permission_p_recursive_array"

Before, a sample query used 300K buffers, now it is down to 2.6 buffers.

Under bad conditions, the old query used 2s or more.

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Cleanup the vestigial moderated_p flag

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Get rid of the intermediate "room-enter" page and enforce all of the relevant permission in place in the "chat" page, cleanup variables and update automated tests

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Allow to toggle chat active state from the chat list

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Chat reform:

- use consistently package_id to model belonging of a chat object to a particular package instead of the context_id

- set context_id to the package_id, as was already the case in practice, for permission checking

- make sure package_id exists and set it to the context_id in case it doesn't to handle legacy installations

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Fix typo

admin_p and user_p are actually never displayed, so it doesn't make sense to have them in the select clause. What makes sense is that we filter for those chats we can actually access

base_url is in fact just the package_url from the connection

base_url can be computed just once

Reduce divergency between oracle and postgres codebase and make the query less awkward

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Don't overquote URL

Whitespace cleanup + Add editor hints

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Chat reform:

- rework xotcl-core chat machinery to return its responses through JSON and include information about active users

- depend on xowiki instead of xotcl-core only

- exploit xowiki "Comet" server push implementation when the browser supports it

- reduce code duplication

- drop plain HTML chat

- reduce hardcoded styling

- minor cleanups

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Revert massive replacement of empty list creation sentences. The use of '[list]' instead of '{}' adds semantics that could be used for performance improvements in the future, such as using a different internal representation. There is already work in this direction, avoiding the generation of the string representation during comparison of empty strings (huge thanks to Stefan Sobernig for the pointer: https://core.tcl.tk/tcl/info/44527c632ed609c2).

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Prefer '{}' to '[list]' when creating empty lists

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Fix boolean expressions in -adp files, make termination after connection closing commands explicit

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

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- apply fresh patches to oacs-5-9 branch

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- remove deprecated calls

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Add headings

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HTML cleanup

1. Merge 2.4.1 to HEAD other than assessment, imsld, lorsm, and views.

2. Bump version numbers to 2.5.0d1.

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HTML Strict cleanup. Accessibility improvements.

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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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Fixing a lot of bad programming techniques and try to get .LRN out of the package, in vain...

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"New version of the package"

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Merged changes to HEAD ...

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