[Bug-wget] --bit option name

[Hrvoje Niksic]

I'd like to suggest that the new --bit option be named --bps instead.
The use case for this option is reporting of download speed in [gmk]bps,
not expressing all quantities in bits.  Besides, the word "bit" has
other meanings (small piece), while "bps" is quite recognizable to the
target audience for the option.