[[Imported from SVN: r4981]]

new method get() which does not take a default parameter and throws an exception if the key is not found in the parameter set

[[Imported from SVN: r4980]]

because the code doesn't contain conditionals.

[[Imported from SVN: r4979]]

[[Imported from SVN: r4978]]

[[Imported from SVN: r4976]]

[[Imported from SVN: r4973]]

of constructing it.
Added assign methode as ther is no operator=(const T&) in std::tr1::array<T,int>.

[[Imported from SVN: r4970]]

[[Imported from SVN: r4968]]

[[Imported from SVN: r4967]]

[[Imported from SVN: r4966]]

[[Imported from SVN: r4963]]

The trick is to test for doc/doxygen/Doxydep which is only there in
the svn tree!

[[Imported from SVN: r4960]]

[[Imported from SVN: r4958]]

I tried to keep the interface backward compatible. Still there might
be some issues if you used template meta programms specialised for Nil
or using the internal first and second. Please report them.

Note: There are still some issues:
Empty tuples are currently not supported!

[[Imported from SVN: r4956]]

[[Imported from SVN: r4955]]

[[Imported from SVN: r4954]]

[[Imported from SVN: r4952]]

The segfault I reported remains extremely elusive, I have not been able to reliably
reproduce it, let alone track iit down.  On the other hand, my production codes runs 
smoothly with this patch.

Also, FixedArray is deprecated now.


[[Imported from SVN: r4949]]

[[Imported from SVN: r4948]]

[[Imported from SVN: r4946]]

[[Imported from SVN: r4945]]

[[Imported from SVN: r4943]]

[[Imported from SVN: r4942]]

[[Imported from SVN: r4941]]

[[Imported from SVN: r4938]]

[[Imported from SVN: r4937]]

[[Imported from SVN: r4936]]

[[Imported from SVN: r4935]]

because it caused an extremely strange segfault.  No idea why.

[[Imported from SVN: r4934]]

Use system implementation of 'array' if present.  Deprecate constructor array(const T& t) because the libstd++ implementation doesn't have it

[[Imported from SVN: r4933]]

check for the tr1/array header, and, for the future, check for the headers 'typetraits' and 'array' as well

[[Imported from SVN: r4932]]

[[Imported from SVN: r4931]]

[[Imported from SVN: r4929]]

[[Imported from SVN: r4928]]

[[Imported from SVN: r4926]]

[[Imported from SVN: r4925]]

[[Imported from SVN: r4923]]

[[Imported from SVN: r4919]]

[[Imported from SVN: r4918]]

[[Imported from SVN: r4916]]