Qore 0.9.6

This is a minor bugfix new release of Qore; as of Qore 0.9.6, Qore releases will use semantic versioning; features implemented and issues addressed

Summary of changes:

• several race conditions fixed that could cause stability problems with high-performance multithreaded code
• implemented q_gettid() as the standard C++ API to get the thread ID, as when libqore is initialized from Python or Java and another library provides the gettid() function, it resulted core dumps
• other fixes to modules and libqore functionality

See the release notes for more info.