Provide single-click option to cleanup all caches and rebuild menu

Site admins need an easy way to clear all cache tables, cleanup template caches and rebuild the menus.

1. Insert button on the "Update Directory Path and URL" form (CRM/Admin/Form/Setting/UpdateConfigBackend).
Button title = "Cleanup Caches"
onclick = execute:
$config->cleanupCaches( );

Place button on top of form and remove the top Save and Cancel buttons.

2. Modify menu title from 'Update Directory Path and URL' to 'Cleanup Caches and Update Paths'

• modify for new installs
• modify for upgrade