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The functions call the kernel setup() and cleanup() member function with
the tree (optionally) if they exist or do nothing.

Better consistency with rest of code.

The accessors were references to private members, they are changed to
standard member function accessors.

 - Use the multipole_t, local_expansion_t and symbolic_data_t type
   definitions from the kernel data.

 - Adapt the FMM operators calls to use the new interface.

 - In many places, new lists have to be created from the original cell
   list to get the specific parts of the data we need. The impact on
   performance has yet to be studied.

 - Simplify/shorten code using the above type definitions. Especially
   for the StarPU implementation.

 - A default symbolic_data_t type is provided by the FNode class when
   the kernel data does not provide it (which it only should for passing
   custom symbolic data).

 - Update the UnifFlopsKernel to use the new layout.

The adaptive algorithm have been updated to use them.

The existing P2P is instead extended to add a boolean. The change is
still experimental.