first step.
Migration to OpenCL.Net.2.1.3.0 finished.
Attempt to fix FSharp.core version for .net 4.0
Rm unnecessary dependences.
Update packages.
FSharp.Core 4.3 -> FSharp.Core 4.0
FSharp.Core 4.3 -> FSharp.Core 4.0
Brahma 0.1.4992.0