Implementation of feature request 785

On the basis of the feedback from the last time i've updated the code 
Changes are
1)Added user_info.php -> changed few variables name, Added MIME detection
2)Added user_info.lib.php->Changed function names with PMA prefix, added header to workaround CSP 
3)server_privileges.lib.php -> added the link to userinfo.php to both username and hostname rather than just hostname
4)updated doc files. Updated createtables.sql and createtable_drizzle.sql
5)Relations.lib.php->To check for relation for phpmyadmin storage configuration
6)Added option to configure user info table during storage configuration, so that i dont have to harcode the tables
7) Updated code so as to use new way of function calling PMA_DBI_fetchResult etc.

I've updated my codebase to the best way i can think of, however If there is anything else that i'm missing than please guide me.

Thanks