Ref https://gitlab.com/shyft-os/shyft/-/merge_requests/976
5.1.8 - Ref https://gitlab.com/shyft-os/shyft/-/merge_requests/963 - stm/shop improved plant tunnel plant handling in shop emitter
5.1.7 - fixes dstm set_ts when target ts is empty - Ref https://gitlab.com/shyft-os/shyft/-/merge_requests/964