Update an existing installation:

1.0beta2 to 1.0:
================
1 - edit the "User class" and remove all your previous 'yubikey' and 'yubikey_backup' attributes
2 - add a new attribute of type 'matrix':
        Type=Matrix
        Name="YubiKey Keys (once set, you CANNOT login without your YubiKey!)"
        Description="If you have multiple keys, register each of them by recording a sample of generated code from each of them"
        Identifier="yubikeys"
        Not required, Not searchable, Not collection
        Columns:
                Name:name
                Key:key

1.0beta1 to 1.0beta2:
 =====================
 1 - add a new attribute to the "User" content class:
 Type="YubiKey OTP"
 Name="Backup YubiKey OTP"
 Identifier="yubikey_backup"
 Not required, Not searchable, Not collection
 2 - extract the archive in your extension/ folder

1st TIME INSTALLATION:
======================
 1 - edit your "User" content class
 2 - add a new attribute to the "User" content class:
 Type="YubiKey OTP"
 Name="YubiKey OTP (once set, you CANNOT login without your YubiKey!)"
 Identifier="yubikey"
 Not required, Not searchable, Not collection
 3 - add a new attribute to the "User" content class:
 Type="YubiKey OTP"
 Name="Backup YubiKey OTP"
 Identifier="yubikey_backup"
 Not required, Not searchable, Not collection
 4 - add a new attribute to the "User" content class:
 Type="Checkbox"
 Name="Use my YubiKey OTP for multi-factor. You will need both password and
 YubiKey to sign in"
 Identifier="multifactor"
 Not required, Not searchable, Not collection
 5 - extract the archive in your extension/ folder
 6 - activate the extension in your site.ini.append.php. Make sure that
 qhyubikey extension is activated before ezwebin/ezflow
 extension.
 7 - regenerate autoload and clear ini and template caches.
 8 - edit your user information and use your YubiKey to generate a OTP
 string to be recorded.