Sara Arjona a26cfe71d3 MDL-65809 upgrade: clean < 3.5.0 upgrade steps
This just deletes all the upgrade steps previous to 3.5.0. Some
small adjustments, like tweaking globals can also be applied
when needed.

Also includes an upgrade step to prevent upgrading from any
version < 2018051700 (v3.5.0) as anti-cheating measure.

Previous commits have removed/deprecated all the upgradelib functions
not used anymore in codebase. Deletion has been documented in corresponding
upgrade.txt files:

- upgrade_fix_block_instance_configuration()
- upgrade_theme_is_from_family(), upgrade_find_theme_location()
and linkcoursesectionsupgradescriptwasrun setting
- upgrade_block_positions
- upgrade_fix_config_auth_plugin_names()
 and upgrade_fix_config_auth_plugin_defaults()
- format_xxx_upgrade_remove_numsections(), format_xxx_upgrade_hide_extra_sections()
and format_xxx_upgrade_add_empty_sections()
- filter_mathjaxloader_upgrade_cdn_cloudflare()
and filter_mathjaxloader_upgrade_mathjaxconfig_equal()
- get_assignments_with_rescaled_null_grades()

These have been kept because continue being used by restore:

- \core\task\refresh_mod_calendar_events_task
2019-12-20 12:20:43 +01:00
..

Official Chat Module for Moodle
------------------------------

The chat module now supports a backend daemon for
more efficiency.

It's still buggy and being worked on, but if you
want to test it and help out here are some quick
instructions:

1) Admin -> Config -> Modules -> Chat -> Settings

2) Set the method to "sockets" and set up the ports etc

3) Start the server like this (from the Unix command line):

   cd moodle/mod/chat
   php chatd.php --start &

4) Go to a chat room in Moodle and open it as normal.

------

KNOWN PROBLEMS

 - User list is not always working
 - Some browsers (eg Safari) cause lines to be repeated
   by 10 - 20 times
 - Occasionally "Document was empty" messages

Help solving these very welcome!


Martin, 31 July 2004