added test_fsi to SUBDIRS

Gilles it works for me here

added new solvers for fluid/structure interactions. test_fsi_newton, test_fsi_dd and test_fsi_picard will soon be united into one test case

* added timing output

* assume more general case for ip stabilization (all terms reassembled)
* one pressure node is fixed again

factory clone for BCVector too !!
boost is way to cool

it fixes Gilles bug when abstracting FSI
it fixes huge issues with pointer ownership

main.hpp also includes an element-wise filter to opendx, which was parametrized to be used also with continuous-FEM (to be checked).

 * boost is not installed
 * boost::signals is not installed (but boost is installed)

new BC data and/or switch between the two
added NavierStokesWithFlux for Christian V.
experiment with observer pattern and actually it is
very powerful stuff
added new test for NavierStokesWithFlux in testsuite/test_ns_cyl_flux/

anyway all NS tests should move to test_ns or test_cfd soon
likewise for all other related tests: they should move in their own category
(mass transport,multiscale, fsi)...

  note that the values are still bogus
* display whether reading inria or mesh++ mesh

please study the clone factory to see what I have done
also I use boost::shared_ptr<> to ensure that the ressources
are destroyed at the proper time.

added modifyBC() (for NavierStokesWithFlux) but not finished yet

of the observer pattern
next Commit of NavierStokesWithFlux will show how to use
the observer pattern

Some pollution: I need these overloading to commit a first release of DG-FEM test, but they will be cancelled out when the new version of pattern (or whatever it will be) is ready (see C. Winkelmann's mail on life-dev mailing list).

It is used to retrieve the exact type of a class
when using class hierarchies

* added Cloning factory aka abstract factory
  it will be used in the boundary conditions classes
* testsuite/lifecore/test_factory.cpp has a test for clone factories
  now
* test_factory is now enabled

this is the first COMMIT that makes boost:: a requirement !

factories rely on boost::function<> for functors.