Add a new group "Bvec" to HydroBase, containing the magnetic field.

Same as the velocity "vel", this is a vector group with three
components.

There are also two new parameters "initial_Bvec" with default value
"none", specifying that Bvec does not have storage.  This keeps things
backward compatible.  Another parameter "Bvec_evolution_method"
specifies its method; the default value is also "none".  These
parameters need to be extended by initial data and evolution thorns
that handle magnetic fields.


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinBase/HydroBase/trunk@18 57fe0bb3-ccba-405f-9b23-de0201f165b7

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