Adds a callback xxx_pre_enable_plugin_actions in admin/modules.php
which plugins can use to force additional actions before enabling the
plugin. The return value (bool) from the plugin callback method
specifies whether the process of enabling the plugin should continue
after the added actions or not.

I suppose the original reasoning was that the web services protocols are
pluggable and that plugins can provide external function. But those are
not good reasons to put the whole Web services section under plugins.
Web services are not a plugin type and they always felt very
counter-intuitive there.

From the server administrtaion perspective, web services are similar to
scheduled tasks and therefore, they should live in the same section.

This function was used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
it internal. Deletion has been documented in corresponding
upgrade.txt files.

These functions and setting were used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
them internal. Deletion has been documented in corresponding
upgrade.txt files:

- upgrade_theme_is_from_family()
- upgrade_find_theme_location()
- linkcoursesectionsupgradescriptwasrun setting

The upgrade_fix_block_instance_configuration() function was used
only by deleted upgrade steps so it's safe to proceed with straight
deletion, considering it internal. Deletion has been documented in
corresponding upgrade.txt files.

AMOS BEGIN
 MOV [configopentogoogle,admin],[configopentowebcrawlers,admin]
 MOV [opentogoogle,admin],[opentowebcrawlers,admin]
 MOV [check_google_details,report_security],[check_crawlers_details,report_security]
 MOV [check_google_error,report_security],[check_crawlers_error,report_security]
 MOV [check_google_info,report_security],[check_crawlers_info,report_security]
 MOV [check_google_name,report_security],[check_crawlers_name,report_security]
 MOV [check_google_ok,report_security],[check_crawlers_ok,report_security]
AMOS END

Damyon Wiese authored Sep 06, 2016 and Dan Poltawski committed Sep 23, 2016

Part of MDL-55071

Frederic Massart authored Aug 18, 2016 and Dan Poltawski committed Sep 23, 2016

Part of MDL-55071