constructor and reset() taking a deleter.

This solves the issue with bcrsmatrix.hh in fs#727.

Please merge to release.

[[Imported from SVN: r5871]]

[[Imported from SVN: r5869]]

gcc-4.4 failed to compile the shared_ptrtest with ''NULL was not declared in this scope''. Introduced usage of null_ptr to fix this.


[[Imported from SVN: r5868]]

[[Imported from SVN: r5749]]

[[Imported from SVN: r5746]]

A proper cast-to-bool is still missing.

[[Imported from SVN: r5734]]

[[Imported from SVN: r5733]]

Follow the stl standard: the default constructor of a shared_ptr creates a NULL pointer, and does NOT allocate memory

[[Imported from SVN: r5654]]

[[Imported from SVN: r5647]]

* update Makefiles and configure

[[Imported from SVN: r5643]]

if an implementation of shared_ptr has been found in either std, tr1, or boost, then use that one.  If not fall back on our own

[[Imported from SVN: r5642]]

rename the method count() to use_count().  This is the naming of the standard shared-pointer implementation

[[Imported from SVN: r5641]]

the class from SmartPointer to shared_ptr.  That way the implementation
is like the tr1 one.  The old file is deprecated.  The tr1 implementation
is not yet used even on platforms that have it, because I have to think
of a proper test first.

[[Imported from SVN: r5630]]

[[Imported from SVN: r5504]]

  pointer.
* This pointer can be passed to the SmartPointer Constructor

[[Imported from SVN: r5503]]

[[Imported from SVN: r4726]]

[[Imported from SVN: r3086]]

[[Imported from SVN: r1321]]

[[Imported from SVN: r1047]]

[[Imported from SVN: r1036]]

[[Imported from SVN: r1016]]

[[Imported from SVN: r1014]]