src/main/java/wycc/WyMain.java
private static String determineGlobalRoot() throws IOException {
		String userhome = System.getProperty("user.home");
		String whileydir = userhome + File.separator + ".whiley";
		return whileydir;
	}
private static String determineGlobalRoot() throws IOException {
		String userhome = System.getProperty("user.home");
		String whileydir = userhome + File.separator + ".whiley";
		return whileydir;
	}
Determine the global root. That is, the hidden whiley directory in the user's
home directory (e.g. ~/.whiley).

@param tool
@return
@throws IOException