charts: repeat samples on missed deadlines

This applies charts->this_sample_duration by advancing and drawing
the graph bars this_sample_duration times.

It's a bit crufty with conditionals especially where it overlaps
with deferred_pass handling... but seems to work ok in initial
tests.

Future work will have to add a row indicating how far we've
deviated from the scheduled sample time... Maybe cyan would show
how premature we were, and red how late we were.  Where 100%
would be the entire sample interval was exceeded, but < 100%
would show our still more or less on-schedule scheduling
deviations.

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