Merge branch 'master'
Added field 'data_iscrizione' to 'iscrizioni' table
Merge branch 'master'
switcher subscrined-list display
switcher subscribed list display
fixed bug in alter_table_iscrizioni.sql
Switcher user subscribed display
switcher user subscribed instance display
Added table column style
Added ajax/updateSubscription.php script
Switcher users subcribed display
added dataTables plugin for sorting columns containing an html select

note: in the td to be sorted there must only be the select

usage: include the js and add "sType":"select" to the column definition you wish to sort in the dataTable "aoColumns" init section
Addded userCertificate files
Switcher user subscribed display
Merge branch 'master'
Modified switcher user subscribed list
Switcher users subscribed display
Added UserCertificate to switcher class display
Added userCertificate to switcher display instance course
Added comment to Check_Requirements_Certificate() method