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Refactoring: Add a FILE* parameter to po_helper instead of using g_Writer.GetStream()
This makes the calling contract clearer (one fewer global variable).
It also makes the contract simpler in the case where g_Writer.GetStream() is not the desired target.

Change RUNPRINTTEST to use READRAWLINE to check output.
This gives higher fidelity, as READRAWLINE doesn't remove comments from the input stream.

Add a comment to document the parameters for RUNPRINTTEST.

Add a regression test for saving a non-ASCII workspace.

Remove an unused local variable in SAVETEST.SMOKETEST.HELPER.

Add a comment to RUNPRINTTEST since it wasn't immediately obvious to me why a line of code existed.

Update BACKSLASHEDP to work in the Unicode build.

Merge changes from trunk, mostly to get tests for BACKSLASHEDP.

Test the interaction between DRIBBLE and READLIST reading from "stdin".

Add regression tests for BACKSLASHEDP