Analyzer: Print detailed kpageflag statistics

Analyzer: Print detailed kpageflag statistics

The print_page_statst() function is modified so that it will count how
many pages are found with each of the kpageflag bit set. The collected
stats are then printed so that count for every non-zero kpageflag is
shown. Since there are so many kpageflag flags (22 at the moment),
zero number counts are alwaysy omitted.

Since root priviledges are required to read the /proc/kpageflag
interface, all of the kpageflag counts are zero if user does not have
root priviledges.

Signed-off-by: Timo Kokkonen <kaapeli@itanic.dy.fi>