fix the help string for the file arg of info
fix error message for FileNotFound on info
better error message in case the file is not bloscpack compressed
add a refactoring README
update the README to describe the two new subcommands
show that each new subcommand has a help switch
show an example of using the info subcommand
update the Changelog a little
people who know what they are doing can depend on the files

If you know which version you used, you *should* be able to unpack your files
again.
show an example of using 'max'
adding cram tests, provide some sanity checking of the CLI
document testing with cram
make a note to list prior art and inspiration