Notification of string changes

Author: sam marshall
MDL-44070 Conditional availability enhancements (2): subsystem, API
This commit defines the new /availability root folder, with
/availability/classes, /availability/tests, and
/availability/condition where the condition plugins will live.
Condition plugin prefix is availability_, e.g. availability_date.

Rationale for this organisation:

1. I was originally going to put this in /lib/availability but
it has been pointed out that putting even more junk in lib
is probably bad.
2. 'availability' and 'condition' are the two names used in code
to refer to this system ($CFG->enableavailability).
3. The prefix has to be short enough to allow database tables
(although in practice I assume that condition plugins will not
normally contain database tables).

The new API includes a Boolean tree structure that controls the
availability of an item.

AMOS BEGIN
CPY [availabilityconditions,core_condition],[restrictaccess,core_availability]
CPY [enableavailability,core_condition],[enableavailability,core_availability]
CPY [configenableavailability,core_condition],[enableavailability_desc,core_availability]
AMOS END


http://git.moodle.org/gw?p=moodle.git;a=commit;h=d3db4b037cc3d0ba4afdd51fa9a9565dac1385e3
http://github.com/moodle/moodle/commit/d3db4b037cc3d0ba4afdd51fa9a9565dac1385e3

+ 2.7 en [manageplugins,tool_availabilityconditions]
+ 2.7 en [pluginname,tool_availabilityconditions]
+ 2.7 en [accessrestrictions,availability]
+ 2.7 en [addrestriction,availability]
+ 2.7 en [and,availability]
+ 2.7 en [condition_group,availability]
+ 2.7 en [condition_group_info,availability]
+ 2.7 en [enableavailability,availability]
+ 2.7 en [enableavailability_desc,availability]
+ 2.7 en [error_list_nochildren,availability]
+ 2.7 en [hidden_marker,availability]
+ 2.7 en [hidden_individual,availability]
+ 2.7 en [invalid,availability]
+ 2.7 en [itemheading,availability]
+ 2.7 en [shown_individual,availability]
+ 2.7 en [hide_verb,availability]
+ 2.7 en [show_verb,availability]
+ 2.7 en [hidden_all,availability]
+ 2.7 en [shown_all,availability]
+ 2.7 en [label_multi,availability]
+ 2.7 en [label_sign,availability]
+ 2.7 en [list_and,availability]
+ 2.7 en [list_and_hidden,availability]
+ 2.7 en [list_or,availability]
+ 2.7 en [list_or_hidden,availability]
+ 2.7 en [list_root_and,availability]
+ 2.7 en [list_root_and_hidden,availability]
+ 2.7 en [list_root_or,availability]
+ 2.7 en [list_root_or_hidden,availability]
+ 2.7 en [listheader_sign_before,availability]
+ 2.7 en [listheader_sign_pos,availability]
+ 2.7 en [listheader_sign_neg,availability]
+ 2.7 en [listheader_single,availability]
+ 2.7 en [listheader_multi_after,availability]
+ 2.7 en [listheader_multi_and,availability]
+ 2.7 en [listheader_multi_before,availability]
+ 2.7 en [listheader_multi_or,availability]
+ 2.7 en [manageplugins,availability]
+ 2.7 en [missingplugin,availability]
+ 2.7 en [or,availability]
+ 2.7 en [restrictaccess,availability]
+ 2.7 en [setheading,availability]
+ 2.7 en [unknowncondition,availability]
+ 2.7 en [type_availability,core_plugin]
+ 2.7 en [type_availability_plural,core_plugin]