Make the program more suitable for co-op use

* sessionfuncs.php: Add user's full name to
$_SESSION['sesUSERFULLNAME'].

* invoice.php: Added querying invoice creator's user data into array
$userData, which is passed on to printer's init function.

* invoice_printer_base.php: Added $userData to init() function's
parameters.

* invoice_printer_contactperson.php: New PDF printing template which
includes the invoice maker's contact info.

* index.php: Added printing of user's name to up-right corner, which is
linked to account settings.

* form_switch.php:
-Added ability for normal users and backup managers to change their
contact info and password.
-Added new database user info fields to $astrFormElements
-Disabled the control to change user level for everyone except admins

* create_database.sql:
-Added new int(11) called creator_id into table mlinvoice_invoice for
storing who's made the invoice
-Changed the order in which the tables are created so that new foreign
key CREATOR_ID in mlinvoice_invoice works
-Added new columns phone, address1, address2 and salt into
mlinvoice_users

* css/style.css: added div#loggeduser style for printing user's name as
described in index.php

* list_switch.php: added new column displaying u.name related to
i.creator_id in case 'invoices'.