The Collector, RTC, fix and continue, and Watchpoints

The collector and fix and continue work with multithreaded applications. RTC works with multithreaded applications, however a libthread patch is needed.

In the Solaris 2.5.1 operating environment, the implementation of watchpoints does not depend on the operating system, and has the potential of too easily getting the multithreaded application into a deadlock or other obscure problems.