clean up flags package a bit. fix a bug in Usage message - would print current value instead of default.
clean up flags package a bit.
fix a bug in Usage message - would print current value instead of default.

R=rsc
DELTA=53  (7 added, 4 deleted, 42 changed)
OCL=24323
CL=24323

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go