x write basic exmaple from TSV file
x pass-through basic thing in pipeline
x pretty printer (using column writing, term color)
- convert
    to/from TSV
    to/from JSON
- example apps
    ls
    stat
    df, mount, something like that
    trivial web server (or other thing that logs)
- example datasets (eg, for benchmarking): compare TSV, AFT, JSON
    million-line CDX
    log file
- manpage (?)
- build .deb and installable
- helper library
    => R/W trails/wrappers
    => header struct
    => iterate rows (from input)
    => pretty-print output based on tty status
    => validation/check modes
    => stream mode/helper for subprocesses
- tests
- compare with xsv command (?)
- reimplement basic commands
    cut (accept field names)
    cat (combining files with compatible headers)
    head, tail
    wc (count rows, records)
    format (accept field names)
    grep/match/filter by column value?
    paste
    uniq (by column)
    sort (by column)
    join

- extended commands
    parallel (with column names)
    shuf
    comm
    expand/unexpand
    nl
    seq

ideas:
- python stuff
- C stuff
- log log format integration
- rust serde integration
- aft-header: pretty-prints header as rows
- aft-single: pretty-print single row (first?) as rows
- aft-format (or printf?) "this {col1} to that {col2}" "some other column"
- aft2json, json2aft
- aft2html
- aft-stats: sum, mean, stddev, min, max
- aft-sql