Updated copyright notices to include the year 2018.
global: Use t_buffer_create sed -i -e 's/buffer_create_dynamic(pool_datastack_create(), */t_buffer_create(/g'
dict-sql: dict doesn't support NULL values, so convert SQL NULLs to ""
global: Use PRI* macros and %zu instead of casting
lib-dict: Move libdict_backend to lib-dict-backend