FIX: on Windows, use the default path : "${SOFA_TOOLS_DIR}/qt4win" if the QTDIR environment variable is not set and if the folder qt4win exists

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10076 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: hop

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10077 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: large refactoring of AssembledSolver/AssemblyVisitor

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10078 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: docs

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10079 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: misc bug fixes

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10080 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: fixed LDLT solver (yay!). Incidentally, CompliantCloth.scn works again.

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10081 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: fixed RigidJointMultiMapping

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10082 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: stabilization mask is now a data

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10083 b7f1a160-662a-0410-a6d8-bea165342f16
Compliant: added a simple stabilized angular_spring.py example

git-svn-id: svn://scm.gforge.inria.fr/svnroot/sofa/trunk@10084 b7f1a160-662a-0410-a6d8-bea165342f16