Averagers should have interface against iterators

[Peter]

I suggest we remove interface against all containers and only have doubles and ranges.

[Peter]

We now have iterators and should use them.

[Markus Ringnér]

We have decided:

• Averager classes should support iterators and not containers.
• The add functions should be members.

[Peter]

I found an annoying thing:

If we make add a range function a member function it will look something like

template<typename T>
add(T first, T last);

and also we have the normal add function

add(double, u_int n=1);

These are kind of in conflict beacause if you write add(3,5) compiler will choose template function and it wont compile because u_int has no operator*.

Therefore I think we keep add range functions as free functions.

[Markus Ringnér]

Yes, but add(3.0,5) would work.

[Peter]

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