[Dune] [#1094] Compiling Generic Reference Elements Requires too much Memory (Attachment added)

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FS#1094 - Compiling Generic Reference Elements Requires too much Memory
User who did this - Martin Nolte (nolte)

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The attached patch completely removes the template metaprograms for GenericReferenceElement<void,dim> at the expense of additional runtime complexity. Compilation is now extremely fast.

In 8d, the creation of the reference elements (which previously could not even be compiled) now takes around 60s (on my desktop machine), their memory demand is around 250M.

gcc still does not compile 10d with its default settings due to heavy template instantiation. For the void reference element, this could be circumvented by a specialization of the GenericReferenceElementContainer.

I should emphasize that, due to the required mappings (method global), the non-void reference elements still require a low of memory to compile. With gcc-4.6, the GenericReferenceElementContainer<double,5> requires more than 6G to compile (on my 64-bit desktop machine).
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