Add basic support for hashing using Dune::hash

This patch introduces the functor Dune::hash in a similar manner to
other C++11 functionality by importing the definition from namespace std.

Apart from that, the patch also provides some basic functionality to simplify
making user-defined types hashable, in particular functions for combining hashes
and hashing iterator ranges as well as a mechanism for defining the struct
specializations required by std::hash and std::tr1::hash in the correct namespace.

The current implementation will first try to use std::hash and, if that fails,
attempt to fall back on std::tr1::hash. If that is not available either, hash
support is disabled as there is no homegrown fallback for now.
The extension mechanism will register the type with both std::hash and std::tr1::hash,
if available. This should make it possible to use unordered_{set,map} from both C++11
and TR1 without having to specify a custom hasher.

Kudos to Steffen Müthing, see FS#1192

[[Imported from SVN: r7065]]

Remove cast operator that caused Clang warnings.
This fixes FS#1207.

Kudos to Ansgar Burchardt for the patch.

[[Imported from SVN: r7064]]

Ignore eigenvaluetest.
Reordner member variable assignments to avoid pedantic warnings in
shared_ptr.
Only activate boundary checking in dynmatrixtest if not already active.

[[Imported from SVN: r7063]]

[[Imported from SVN: r7062]]

Capabilities to compute eigenvalues on non-symmetric matrices
Code contributed by Arne Morten Kvarving.

[[Imported from SVN: r7061]]

[[Imported from SVN: r7060]]

[[Imported from SVN: r7058]]

Add check for libgmpxx.
It should not happen but I had the problem with two systems (Mac OS X
and Hermit XE6) that gmpxx.hh was found but no libgmpxx.

[[Imported from SVN: r7057]]

[[Imported from SVN: r7056]]

see FS#1055 for details


[[Imported from SVN: r7055]]

[[Imported from SVN: r7053]]

[[Imported from SVN: r7052]]

once. Improved help string.

[[Imported from SVN: r7051]]

Forced initializing to zero.
Compiles with clang again.

[[Imported from SVN: r7049]]

Support counting even if the pointer type is converted to a compatible
base class.

Previously

class A{};
class B: public A{};

shared_ptr<A> b(new B);
shared_ptr<B> b(a);

b.get_count()==1 && b.get_count()==1 would wrongly hold true.

[[Imported from SVN: r7047]]

base class.

Previously

class A{};
class B: public A{};

shared_ptr<A> b(new B);
shared_ptr<B> b(a);

b.get_count()==1 && b.get_count()==1 would wrongly hold true.

[[Imported from SVN: r7046]]

Make test runs through again.

[[Imported from SVN: r7045]]

(Support type conversion for shared_ptr. Needed for gcc-4.1.)

[[Imported from SVN: r7043]]

[[Imported from SVN: r7042]]

[[Imported from SVN: r7041]]

test initialization from nullptr
fix bool cast of Dune implementation

[[Imported from SVN: r7040]]

[[Imported from SVN: r7039]]

[[Imported from SVN: r7038]]

Rename Power_m_p to StaticPower, which is a bit more telling, and conforms better to the Dune naming scheme

[[Imported from SVN: r7037]]

Good intentions, but not very elegantly done.  Too many people
got annoyed by the warning message.

[[Imported from SVN: r7036]]

Improve METIS test, tested with versions 4.0.3 and 5.0.2.

[[Imported from SVN: r7035]]

Add excplicit cast from double literal 0.5 to field_type to avoid Clang warnings.

[[Imported from SVN: r7034]]

Taken from hcube.cc in dune-grid.

We may want to unify the naming eventually.

[[Imported from SVN: r7033]]

There are lots of power implementations all over our code.
This is the first step of some cleanup.  It moves the class Power_m_p
from misc.hh (like who's ever gonna find it there...) to a separate
header power.hh.  Other implementations will be collected there as
well, if appropriate.

With the patch, including misc.hh will issue a cpp warning that people
who include misc.hh only for Power_m_p should now include power.hh
instead.  This is not great, because it also affects people who include
misc.hh for something else.  Bear with this for a while; I couldn't
think of a better solution.

[[Imported from SVN: r7032]]

[[Imported from SVN: r7031]]

[[Imported from SVN: r7030]]

AM_PROG_MKDIR_P is deprecated; see `Obsolete Macros' in the automake manual

Kudos to Elias Pipping

[[Imported from SVN: r7029]]

SVN ignore testdebugallocator*

[[Imported from SVN: r7028]]

move poolallocator to doxygen group Allocators

[[Imported from SVN: r7027]]

- remove obsolete include<malloc.h>
- make mac-os-x work

[[Imported from SVN: r7026]]

fix \code blocks in tupleutility.hh

[[Imported from SVN: r7025]]

fix \code blocks in stdstreams.hh

[[Imported from SVN: r7024]]

fix \code blocks in static_assert.hh

[[Imported from SVN: r7023]]

fix \code blocks in parametertreeparser.hh

[[Imported from SVN: r7022]]

fix \code blocks in forloop.hh

[[Imported from SVN: r7021]]