2.0.3:

* Fix segfault on emission of unconnected signal.
* Test emission of unconnected signals in the test case.
* Suppress compiler warning at dynamic_cast<>-test for good.
  (Help from Christof Petig and Timothy M. Shead.)

2.0.2:

* Suppress compiler warning in compatibility module at
  dynamic_cast<>-test (fix suggested by Timothy M. Shead).
* If a custom accumulator is specified invoke it on signal
  emission even if the signal's slot list is empty. (This used
  to be the case in libsigc++-1.2 as pointed out by Timothy.)