Diff format

• TDIFF tabular diff format - this is the main supported format. It has the aesthetics of classic diffs.
• Highlighter format - a visual diff format suitable for presentation and review in a spreadsheet program.
• CSV DTBL diff format - this is another supported format. It is a CSV readable file.
• CSV patch format - an older format, deprecated but still supported.
• Raw format - a verbose format useful for debugging. Cannot be read for patching.