[Bug-apl] ⎕TC presents as Unix, not APL

[David B. Lamkins]

See IBM Reference, page 335.

⎕tc[2] and ⎕tc[3] differ from the IBM-specified behavior, presenting as
Unix format effectors rather than as APL format effectors.

In particular, APL specifies that ⎕tc[2] should advance the print
position to the start of the next line and ⎕tc[3] should advance the
print position downward one line while retaining the current column
position.

The current behavior of ⎕tc[1] is acceptable according to the IBM
Reference.