added if not exists and update index
added if not exists and update index

since we now use 9.1 as min version we can no use if not exists syntax
in our create table statements -> less posible to get problems
Signed-off-by: 15e7bfe1e49d3f16d61b0796b9dded800c78babd@hotmail.de

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery