Revision 3764

Thread class: Added new methods (POSIX implementation only yet):

* Added methods pushCancelable() and popCancelable() for allowing to
  prevent thread being terminated on critical sections.

* Added methods name(), nameOfCaller() and setNameOfCaller() to allow
  assigning threads human readable names for debugging purposes.

* configure: Always check for availability of pthread_testcancel()
  and use it if so (previously it was only used if explicitly enabled
  by configure script option).

* Raise a compiler warning if pthread_testcancel() is not available.

* Bumped version (2.1.1.svn52).