Also, keep it at table bottom.

JSON only supports strings as object "keys", so true/false become
"true"/"false".

Also, fix default value inversion.

Document stdin & stdout capabilities in README.

Also, display them decoded in report.

For future serialisation support flexibility.

To plug more output formats.

Speeds up parsing a bit, and makes future extensions easier.

Hurts parsing performance by a few percents, sadly, but I don't see any
other way.

Allows dropping use of fixed positioning, as it is not usable on smaller
screens.
Require clicking to display in-table graphs instead of hovering.
Make graphs dragable (add a dependency on jquery-ui).
Move apachedex-specific javascript to a separate file.
Move apachedex-specific css to a separate file.
Lazily render graphs to speed-up page loading with many graphs.
Also, fix tooltip coordinates inside positioned blocks.
Also, apply formatting to tooltip y coordinate.

Also, italicise -h and --help.

Vary line styles to make column & line groups easier to see.
Likewise for overall column group: separate clearly from periodic groups.