Dear Thorsen,
Method BRepMesh::Mesh did nothing more than called BRepMesh_IncrementalMesh with the given parameter, so it had no significant meaning and as result it was removed.
To perform meshing user should use BRepMesh_IncrementalMesh directly, for instance:
#include
...
BRepMesh_IncrementalMesh(aShape, 0.001);
...
It is exactly the same what BRepMesh::Mesh did.
Best regards
FSR