newfs: decreasing bytes/inode

[Charles Hedrick]

Yet another person is running out of inodes on /var because of news.  Yes,
bytes per inode can't be taken below 2048.  If you look at the source for
mkfs you'll find all sorts of complex relationships among the parameters,
because of the data structures used on the disk.  So only certain
combinations of parameters are possible.  If you try to set a parameter
that isn't possible, it ignores you.  it turns out that the easiest way to
get more inodes is to set cylinders per group to 8 (down from a default of
16).