Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+Boost Graph Library
+===================
+
+A generic interface for traversing graphs, using C++ templates.
+
+The full documentation is available on [boost.org](http://www.boost.org/doc/libs/release/libs/graph/doc/index.html).
+
+## Support, bugs and feature requests ##
+
+Bugs and feature requests can be reported through the [Trac issue tracker](https://svn.boost.org/trac/boost/query?component=graph&desc=1&order=id)
+(see [open issues](https://svn.boost.org/trac/boost/query?status=!closed&component=graph&desc=1&order=id) and
+[closed issues](https://svn.boost.org/trac/boost/query?status=closed&component=graph&col=id&col=summary&col=status&col=owner&col=type&col=milestone&col=version&desc=1&order=id)). [Here](http://lists.boost.org/Archives/boost/2015/04/221780.php) is why Trac is still in use.
+
+You can submit your changes through a [pull request](https://github.com/boostorg/graph/pulls). One of the maintainers will take a look (remember that it can take some time).
+
+There is no mailing-list specific to Boost Graph, although you can use the general-purpose Boost [mailing-list](http://lists.boost.org/mailman/listinfo.cgi/boost-users) using the tag [graph].
+
+
+## Development ##
+
+Clone the whole boost project, which includes the individual Boost projects as submodules ([see boost+git doc](https://github.com/boostorg/boost/wiki/Getting-Started)): 
+
+    git clone https://github.com/boostorg/boost
+    cd boost
+    git submodule update --init
+
+The Boost Graph Library is located in `libs/graph/`. 
+
+Boost Graph Library is mostly made of headers but also contains some compiled components. Here are the build commands:
+    
+    ./bootstrap.sh            <- compile b2 
+    ./b2 headers              <- just installs headers
+    ./b2                      <- build compiled components
+
+**Note:** The Boost Graph Library cannot currently be built outside of Boost itself.
+
+### Running tests ###
+First, make sure you are in `libs/graph/test`. 
+You can either run all the 300+ tests listed in `Jamfile.v2` or run a single test:
+
+    ../../../b2                        <- run all tests
+    ../../../b2 cycle_canceling_test   <- single test
+
+You can also check the [regression tests reports](http://beta.boost.org/development/tests/develop/developer/graph.html).