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Known differences between SimH, 11/70, and w11a

SimH: vector flow that sets tbit does not trap

On an 11/70 and on a J11, a vector flow loading a new PS with tbit=1 ends with a tbit trap.

On SimH, a vector flow loading a new PS with tbit=1 does not tbit trap. Confirmed deficiency, will be fixed.

The w11 implements the 11/70 behavior, the corresponding tests are skipped when executed on SimH (see cpu_details.mac test A4.4 part 9,10).

Tested with SimH V3.12-3.