This avoids compiler warning about implicitly rounded to zero

This reverts commit cf4bf4d8.

The epxlicit cast isn't needed anymore as we have a fix for the
ambiguous operator overload.

The bug affected operators: +=, -=, *=, /=. It has been fixed by using:
enable_if<is_convertible<ParamType, FieldVector::valueType>, ...>

oelements stores longs which need to be converted to pointers before freeing.
Previously we actually free the entries of the array oelements and not the
stored pointers.

(the problem are operators of the type FieldVector<double,1> *= int)
clang fails and gcc (4.7) warns about
ISO C++ saying that these operators are aambiguous

When copying PoolAllocators Bard experienced linking errors to the
copy constructor of Pool, which is deactivated. To fix this we added
the copy constructor. Note that it does not copy the pool such that
ownership of allocated memory chunks is clear.

Kudos go to Bard for noticing this and providing the fix.

In addition we removed the copy constructor of the specialization for
void as the default coy constructor suffices.

kudos to Elias Pipping, for details see (FS #1166)
as the new Dune requirements are >= g++ 4.4 we are sure that initializer_list is available.

remove output and replace it with assertions.

This patch introduces a new macro DUNE_UNUSED_PARAMETER(parm) for marking
unused parameters that are there for a purpose (e.g. the prescribed interfac
The macro simply performs a cast to void. In addition all unused parameter w
that I found were removed.

At least Clang 3.2 complains.

These are replacements for TypeTraits::isPointer, TypeTraits::isReference,
TypeTraits::PointeeType.  They reimplement what is available in the
C++11 standard library, and are expected to supersede the TypeTraits
class eventually.

Note: this patch does not pull in the corresponding stl implementation.

That's easier to maintain.

Because the latter uses the C++11 standard library naming.

See FS#1317 for details.

In order to reuse the same source file, the fassign tests pass in
the values to be assigned as a preprocessor define. Unfortunately,
the preprocessor of clang 3.3 dies on this list if it contains spaces.

In order to reuse the same source file, the fassign tests pass in
the values to be assigned as a preprocessor define. Unfortunately,
the preprocessor of clang 3.3 dies on this list if it contains spaces.

also test assignment of fieldmatrix from densematrix

(kudos to Elias Pipping for the patch)

[[Imported from SVN: r7436]]

Fixes FS#1271.
(Kudos to Elias Pipping for the patch)

[[Imported from SVN: r7435]]