atsign_index: set locale harder

Signed-off-by: Martin Stensgård <mastensg@ping.uio.no>
atsign_index: use C locale instead of C.UTF-8

Signed-off-by: Martin Stensgård <mastensg@ping.uio.no>
trim and page large tables

Signed-off-by: Martin Stensgård <mastensg@ping.uio.no>