Do not replace core search widget
Add widget_title filter to replicate the Thematic Search widget behaviour
Deprecate Thematic_Widget_Search

Functionality moved to filter widget_title instead
Give new id to the Thematic_Widget_Meta widget

Avoid name conflict with core Meta widget
Do not unregister core Meta widget
Merge branch 'develop' into widget-checkup

Conflicts:
	library/legacy/deprecated.php
Merge pull request #79 from ThematicTheme/widget-checkup

Do not unregister core widgets

Create separate Thematic Meta widget instead

See #75