1.9.16:

* Fixed compiler warning in sigc::connection (Alexander Nedotsukov, Murray Cumming).
* Fixed examples and made them part of the regular build (Murray Cumming).
* Added header sigc++config.h for configure time checks (Murray Cumming).
* Added configure time checks to determine the correct syntax
  for explicit template method specializations (Murray Cumming).
* Removed code using partial specializations of overloaded template methods
  from test cases. SUN Forte doesn't support this feature (Martin Schulze).
* Fixed compilation for gcc 3.4 (Murray Cumming).