Make use of the per-thread signal stack (Juergen Lock). Fixed %fs in signal handler for non FS_sig case (Ulrich Weigand).
Based on the work of Sergey Turchanov <turchanov@usa.net>.
- new stubs: NtQueryDirectoryFile, ZwQueryDirectoryFile - impl.: RtlAllocateHeap, RtlCreateHeap, RtlDestroyHeap, RtlFreeHeap, RtlGetDaclSecurityDescriptor, RtlGetSaclSecurityDescriptor - impl. by Rex Jolliff (rex@lvcablemodem.com): RtlTimeToTimeFields, RtlTimeFieldsToTime
- implemented RtlGetDaclSecurityDescriptor - stubs for NtEnumerateKey, NtOpenSymbolicLinkObject, NtQueryKey - stubs for NtRaiseException, RtlRaiseException (this both will crash)