[fusion] constructing all elements of the fusion vector with the same argument

Hello,

I recently ran into a need to initialize a fusion vector with a single
argument which is then used to construct all of the vector elements.
For example, something that would allow:

fusion::vector<int, float, double> ones(initialize_all_with(),1);

// at_c<0>(ones) == 1
// at_c<1>(ones) == 1.0f
// at_c<2>(ones) == 1.0;

I hacked fusion::vector so that the above works.  Is this addition of
interest to anyone else?

There is another (perhaps more elegant) solution in implementing a new
fusion "array" Sequence (one where all element types are identical)
which can construct all elements from a single constructor argument,
and then using that sequence to do the above initialization.  E.g.,

fusion::vector<int, float, double> ones(fusion::array<int, 3>(1));

... or (another solution) a make_array function that returns a fusion::vector:

fusion::vector<int, float, double> ones(fusion::make_array<3>(1));

It would be great if one of these solutions (or a different solution)
were added to fusion. I can take a stab at putting something together,
if any of them are acceptable.  That is, unless this is already
possible in some way that I can't see at the moment 

Regards,

Stjepan
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