@author: Pierre GIRAUD (pierre.giraud@camptocamp.com)

Minor enhancements to the user extension available at http://extjs.com/learn/Extension:Multiselect2 :
 - added fromAllowDup, toAllowDup, fromAllowTrash
 - fixed problem with toSortField and hidden icons
 - replaced getTotalCount by getCount in selectAll
 - added fromTpl and toTpl