using %lu. This became more broken when I fixed dbtob() to support byte
offsets >= 4GB. The type had to change to [u]quad_t. Previously the
expressions had type unsigned long and were printed using %d. After
division by 1024, the expressions are guaranteed to fit in an unsigned
long, at least for the standard DEV_BSIZE, so edquota doesn't need to
know about quad_t's explicitly.
Fix all the other format mismatches exposed by compiling with -Wformat
(6 more quota limits of type unsigned long printed using %d and 6 time_t's
(i.e., longs) printed using %d).
