Cleanup spelling, formatting, and usage messages
By default, arcstat should print usage since boot and exit
back out broken stats-since-boot change
some cstyle fixes
wdp fix for OS-301
wdp fix for OS-221
cleanup usage and examples
fix for issue #3 - mfu hits field is wrong
fix for issue #5 - mfug hits field is wrong
add raw output mode (values not scaled).  Fixes issue #2
usage and README updates for issue #2
time in raw output should be seconds since epoch
fix for issue #6