Method addFilespec

src/main/java/fieldbox/io/IO.java:217–223

(String name, String defaultSuffix, String language)

		Filespec f = new Filespec();
		f.name = name;
		f.defaultSuffix = defaultSuffix;
		f.language = language;
		knownFiles.put(f.name, f);
	}

	public Dict.Prop<String> lookupFileSuffix(String filename, Box root) {
		String[] pieces = filename.split("\\.");
		if (pieces.length < 2) return null;
		for (Filespec f : knownFiles.values()) {
			if (f.defaultSuffix.equals(pieces[pieces.length - 1]))