New documentation for the bdb module. Forward-port from rev. 58112, with a few 3k-specific changes.
diff --git a/Doc/library/debug.rst b/Doc/library/debug.rst
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+***********************
+Debugging and Profiling
+***********************
+
+These libraries help you with Python development: the debugger enables you to
+step through code, analyze stack frames and set breakpoints etc., and the
+profilers run code and give you a detailed breakdown of execution times,
+allowing you to identify bottlenecks in your programs.
+
+.. toctree::
+
+   bdb.rst
+   pdb.rst
+   profile.rst
+   hotshot.rst
+   timeit.rst
+   trace.rst
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