String multiplication

[Andrej Mitrovic]

I've always used array.replicate for this.

std.range.replicate seems to be scheduled for deprecation, it only
aliases itself to repeat():

/// Equivalent to $(D repeat(value, n)). Scheduled for deprecation.
Take!(Repeat!T) replicate(T)(T value, size_t n)
{
    return repeat(value, n);
}