Add per-directory synopsis.

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+The dispatch layer objecting is to get public or private symbols from DLLs /
+shared objects and dispatch calls to them.
+
+It used both by the tracing wrappers (to dispatch the intercepted calls to
+their true counterparts) and when replaying traces (to dispatch the calls
+recorded on the file)
+
+All code is generated from dispatch.py Python script, which is then used in
+several places.