readability of more complex sed calls
example section: comments next to commented stuff
README, --help link to ArchLinux, Zsh
--help updated from README
--readme option based on HELP section

i'm over maintaining two copies by hand.

the HELP section uses very minimal markup to maintain
high readability in plaintext, with poor results in HTML.
a bit of sed props it up.
README generated with anarchinst --readme