core: Allow numerics in requested file names

Signed-off-by: Robin Hallabro <robin.hallabro@sveabyran.se>
pdo: Set utf8-names in MySQL

Signed-off-by: Robin Hallabro <robin.hallabro@sveabyran.se>
core: Modify getPost-behaviour

Signed-off-by: Robin Hallabro <robin.hallabro@sveabyran.se>