Accept delay configuration even when someone forgets to indent the time
specification.
Also removed 'weeks' and 'microseconds' from acceptable delay values.
There is a new homeassistant release every 2 weeks and running scripts
are not persisting across restarts. And there is still the option of
using (weeks*7) days if the long delay is really necessary.
And if someone really depends on microsecond delay precision we are
unlikely to be able to provide this accuracy, even milliseconds is
suspect for that matter but will at least allow us to specify some
subsecond delay.
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