Add documentation about dependencies

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+
+Dependencies
+============
+
+Library
+-------
+
+The library has no dependencies (besides an ISO C++ 98 compilant compiler).
+
+Tests
+-----
+
+To run the testcases you need boost.Test (1.35+), and valgrind if you want to
+use ``make memtest``.
+
+Documentation
+-------------
+
+To generate the documentation, you need Doxygen and Graphviz installed.
+