Add bilingual Latin-German side-by-side display support

- Update TSV format to 8 columns: BookName, BookAbbr, BookNum, Chapter, Verse, Latin, German, FootnoteText
- Add printverse_bilingual() function for side-by-side Latin/German display
- Add language filter flags -g (German only) and -L (Latin only)
- Add to_superscript_num() function to convert footnote numbers to Unicode superscripts
- Update processline() to detect and route bilingual verses, German-only, Latin-only, introductions, and footnotes
- Footnotes now display with superscript numbers (¹²³⁴⁵⁶⁷⁸⁹⁰)
- Default mode shows Latin and German in two columns with | separator
- Introductions and footnotes display full-width

New flags:
  -g  show only German (no Latin)
  -L  show only Latin (no German)

allioli.sh

@@ -23,6 +23,8 @@ show_help() {
 	echo "  -l      list books"
 	echo "  -W      no line wrap"
 	echo "  -F      no footnotes"
+	echo "  -g      show only German (no Latin)"
+	echo "  -L      show only Latin (no German)"
 	echo "  -h      show help"
 	echo
 	echo "  Reference types:"
@@ -68,6 +70,12 @@ while [ $# -gt 0 ]; do
 	elif [ "$1" = "-F" ]; then
 		export ALLIOLI_NOFOOTNOTES=1
 		shift
+	elif [ "$1" = "-g" ]; then
+		export ALLIOLI_ONLY_GERMAN=1
+		shift
+	elif [ "$1" = "-L" ]; then
+		export ALLIOLI_ONLY_LATIN=1
+		shift
 	elif [ "$1" = "-h" ] || [ "$isFlag" -eq 1 ]; then
 		show_help
 	else