*8521* Contextualize section constant, introduce compatibility method
*8521* Implement abstract method to retrieve section id, adapt series synonym method
*8521* Introduced statistics helper class
*8521* Added metrics scripts
*8521* Add hook for book file download
*8521* Introduced application code for usage event plugin
*8548* Use pkp lib path constant
*8521* Add default parameter to get plugins template path
*8521* Introduce application side code for usaget stats plugin
*8565* Removing reference to the plugin controller, its now under management
*8521* Moved management handler class to lib
*8521* Introduce acron plugin application side code
*8521* Introduce stats and report page
*8521* Review reminder task is not ported to OMP yet