LoadPerJobIndicator: move ajax php code to indicator_plugins dir

command_info_ajax.php must NOT contain any IndicatorPlugin specific code !

each IndicatorPlugin should implement getAjaxPhpFilename()
PluginManager: plugin class

Author: Kaiyue WANG
Rebased by: Louis BAYLE
PluginManager: Facade (not yet finished)
update classmap.ser
LIB add iNeettuts dashboard
FIX innettuts.js : drag broken if only one 'notSortable' element exists
Dashboard: integration test page (not yet working)