Released v1.6.0

• Fixed: an awful regression in v1.5.3 : CX_BREAK must not call cx_disconnect - never, ever - I must have been walking in a sleep when I've changed this :)
• Added: automatic thread crash detection: a special signal is sent to main thread when unhandled signal is deteced in one of sub-threads. See manpage.
• Change: safe implementation of cx_backtrace().
• Added: cx_backtrace_buf() - printing to a specified buffer.
• Change: removed instance counter - interlocking in cx_backtrace() is no longer needed.
• Change: updated returncode.h to v0.6.7

After tens of hours of testing on few different architectures and with different kernels I can say, that the code is stable.
Removed Beta mark.