FSI dependencies <-> VS dependencies

This script generates a file named __project.fsx, for each proejct which can be #load "__project.fsx" in script intending to use the same dependency graph as the code in VS a file named __solmerged.fsx, at the solution root which can be #load "__solmerged.fsx" in script intending to use the same dependency graph as the code in VS In both cases, this enforce that : **a script compiling in VS should run from FSI **