Adds a Number>>asScaledDecimal method.

Background: I am using this in TimeZoneDatabase to select a numeric data
type for instances of PointInTime. Squeak has #asScaledDecimal: but did
not have #asScaledDecimal (no parameter required). This change set permits
the data type selector for PointInTime to be #asScaledDecimal rather
than #asFloat. It turns out by the way that ScaledDecimal works quite
nicely for representing time.

Dave

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