23068: [CEA 1505] Be able to keep meshing in 2D after having merged the nodes in 1D

    In SMESH_subMesh::ComputeStateEngine() transform errors into warnings if it is caused by mesh edition

Regression of SALOME_TESTS/Grids/smesh/2D_submesh_00/A7
    fix SMESH_subMesh::cleanDependsOn()

Regression of SALOME_TESTS/Grids/smesh/imps_02/C4
    fix getSubMeshes() in SMESH_subMesh_i.cxx and use it in all cases

Regression SALOME_TESTS/Grids/smesh/mesh_Projection_2D_01/B1
    In StdMeshers_Projection_2D treat coincident nodes in all cases