Convert to mysqli

This commit converts all mysql_* function to the appropriate counterparts
in mysqli.
I used this tool for most of it:
https://github.com/philip/MySQLConverterTool
This makes it possible to continue using MysqlDumper with PHP 7.0

sql.php

@@ -124,7 +124,7 @@ if ($sql_to_display_data==1)
 
 if (isset($_POST['tableselect'])&&$_POST['tableselect']!='1') $tablename=$_POST['tableselect'];
 MSD_mysql_connect();
-mysql_select_db($db,$config['dbconnection']);
+((bool)mysqli_query($config['dbconnection'], "USE " . $db));
 
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