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Add warnings for PCH problems.
This prints diagnostics that are useful for understanding PCH errors.

Test that the encoding of the loadstream is saved and restored by lload.

Add tests that LOAD honors the BOM within the file it loads

Always open files in binary mode and handle CRLF <-> LF conversion ourselves
This fixes some problems with READPOS and with reading UTF-16LE.

Merge in change from trunk, mostly to get new tests for LOAD

Add tests for LOAD
- Use LOAD to successfully load a file.
- LOAD a file that defines a STARTUP

Extend LOADTEST to test that line breaks are preserved in procedure definitions.

Change TESTUI to run the test with TRACEINSTRUCTION
This handles when the test outputs something and also prints what test was run.

Refactor FILETEST.OPENREAD.UTF16LE to use WRITEBINARYDATA.
This makes the test more readable.

Add a test for the handling of end-of-line sequences in UTF-16.