[[Imported from SVN: r9196]]

And use it in the test.

This patch uses the new 'constexpr' macro.  Hence it is C++11 only.

[[Imported from SVN: r9195]]

It makes it difficult to be sure that an explicitly
requested type is really handed over to every place.

While we are at it: reverse the order of the template
parameters.  Now first comes the type, then the dimension.
This is more like FieldVector and friends, and hence
should be less confusing.

[[Imported from SVN: r8148]]

[[Imported from SVN: r8145]]

[[Imported from SVN: r7414]]

[[Imported from SVN: r7374]]

[[Imported from SVN: r7097]]

[[Imported from SVN: r6543]]

[[Imported from SVN: r6436]]

[[Imported from SVN: r6430]]

[[Imported from SVN: r6426]]

[[Imported from SVN: r5993]]

[[Imported from SVN: r5991]]

[[Imported from SVN: r5931]]

[[Imported from SVN: r5791]]

[[Imported from SVN: r5783]]

[[Imported from SVN: r5698]]

[[Imported from SVN: r5696]]

[[Imported from SVN: r5668]]

[[Imported from SVN: r5547]]

[[Imported from SVN: r5543]]

[[Imported from SVN: r5532]]

[[Imported from SVN: r5526]]

A rudimentary class implementing tuples of real numbers as a Riemannian manifold.  Mainly for testing

[[Imported from SVN: r5514]]