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15.3.50 Default to Console I/O

The default I/O units, specified by `READ fmt', `READ (UNIT=*)', `WRITE (UNIT=*)', and `PRINT fmt', should not be units 5 (input) and 6 (output), but, rather, unit numbers not normally available for use in statements such as OPEN and CLOSE.

Changing this would allow a program to connect units 5 and 6 to files via OPEN, but still use `READ (UNIT=*)' and `PRINT' to do I/O to the “console”.

This change probably requires the libg77 project.