fix DataManager to process single buffer.
fix DataManager to process single buffer.

YaccConstructor/Brahma.FSharp,VaseninaAnna/Brahma.FSharp,ksmirenko/Brahma.FSharp,unstope/Brahma.FSharp,VaseninaAnna/Brahma.FSharp,YaccConstructor/Brahma.FSharp,VaseninaAnna/Brahma.FSharp,YaccConstructor/Brahma.FSharp,VaseninaAnna/Brahma.FSharp,YaccConstructor/Brahma.FSharp,ksmirenko/Brahma.FSharp,unstope/Brahma.FSharp,unstope/Brahma.FSharp,ksmirenko/Brahma.FSharp,ksmirenko/Brahma.FSharp