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Add a production for dumping the RAWASCII of each character in a word.
This is useful for debugging when a test says that two things which look alike are different.

More explicitly document the behavior of the OPEN* commands when the file exists or doesn't exist.

Add a test case for trying to write to a file that was opened for reading.

Add a test for reading from a file that was opened for writing.

Move FILETEST.NUMBERFILENAME to be closer to the helper it calls.

Add explicit tests for OPEN* procedures when the file exists or doesn't exist.

Improvements to TESTUI
- Exclud test helpers from the list
- Put each widget name within a "testui." namespace
- Add a "reload" button

Fix OPENUPDATE to work correctly with Unicode content.

Add function comment to read_character_encoding

Add a test case for reading a file encoded in UTF-16LE