[review] Dataflow Review starts today, September 1st

The review of Stjepan Rajko's Dataflow library starts today, September 1st, 
and will run until September 10th.

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Description of the library:

Dataflow is a generic library for dataflow  programming. Dataflow
programs can typically be expressed as a graph in which vertices
represent components that process data, and edges represent the flow
of data between the components. As such, dataflow programs can be
easily reconfigured by changing the components and/or the connections.

This review focuses on the Dataflow.Signals layer of the library. For
its data transport mechanism, Dataflow.Signals uses Boost.Signals
which can be used to make lasting dataflow connections based on
function calls. Dataflow.Signals provides the following to facilitate
signals-based dataflow networks:

* A number of useful general-purpose components, and building blocks
  for implementing new components.
* Various free functions and operators for connecting and using components.

The library documentation provides some concrete examples of how
Dataflow.Signals layer can be used. Some examples are:

* Implementing distributed dataflow applications using
  Dataflow.Signals and Boost.Asio
* An image processing network using Dataflow.Signals and Boost.GIL
* A GUI dataflow editor (located in the Dataflow.Blueprint documentation)