small fix
modified in order to suspend the cleaning mechanism of messages tables.
improved negotiateLoginPageLanguage

language matching regExp is compliant to HTTP/1.1 and language ranges
are properly served.
E.g. If users select "en-gb", they will be served any kind of English
document if British English is not available.
alter table to manage language ranges (e.g.: en-gb)
bugfix in createAvailableLayoutsList mehtod

added condition preventing an infinite while loop on non-existent layout dir
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'