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Changed the Timelogs to use both the Systemwide and Project specific TimeEntryActivities

* Added Project#activities to return all the Systemwide and Project specific
activities, excluding Systemwide ones that are overridden.
* Added some tests for TimelogHelper.

#4077

Added project specific Enumeration overrides.

These will be used to track if Enumeration's custom data or active state
is overridden on a project. An overridden Enumeration is one that is associated
with a parent Enumeration.

#4077

Added an active field track if an Enumeration is active on the frontend view.

* Changed TimelogHelper#activity_collection_for_select_options to only use
active TimeEntryActivities.
* Changed TimelogHelper#activity_collection_for_select_options to return a blank
option if the time_entry's current activity is inactive.

#4077

Enumerations can now have custom fields defined on them. #4077

Updated the unit test so Enumerations are tested separately from the subclasses.

Contextual quick search (#3263).
Eg. when viewing issues, the quick search will search issues only.

Change the order of checkboxes for boolean custom fields.

Broken in r2887 for the Rails 2.3.4 upgrade.

Renamed Project#public named_scope so it will not override Ruby's public method

#4056

Mocha is needed for tests.

Renamed the default "Assigned" status to "In Progress". #3605