Unbreak the scheduler, so that periodic events can be rescheduled even

Unbreak the scheduler, so that periodic events can be rescheduled even
in absence of another event for the same target scheduled in the future.

Allow for link width to be modulated from the event scheduler, and
convert integer values to appropriate format for specifying 24-bit
color, so that colors can be specified both as plain integers as well
as using standard Tk color naming conventions.

Bug found by:
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Obtained from: