chg: raise RLIMIT_NPROC if defined and necessary
chg: correct some comments
chg: use pointers for mutexes
chg: change handling of mutexes in ssiSignal_CloseSuccessful()
chg: introduce ssiGet_WaitForClose_thread()
chg: rewrite pthread_atfork_child()
fix: in ssiKill, remove link from ssiCloseList
fix: defer shutdown in slKill() and slCleanUp()
fix: handle already killed links in ssiCloseList correctly
fix: do not call m2_end() twice
fix: set ssiToBeClosed to NULL in m2_end()
fix: use close() instead of fclose() for parent of fork
chg: make 2nd and 3rd arg of timespec_subtract() const
add: introduce sigtimedwait_cygwin()