String getPathname(String childName) {
		String path = getPathname();
		if (path.length() != FileSystem.SEPARATOR.length()) {
			path += FileSystem.SEPARATOR;
		}
		path += childName;
		return path;
	}
Set the name on this domain folder.
@param newName domain folder name
@return renamed domain file (the original DomainFolder object becomes invalid since it is 
immutable)
@throws InvalidNameException if newName contains illegal characters
@throws DuplicateFileException if a folder named newName 
already exists in this files domain folder.
@throws FileInUseException if any file within this folder or its descendants is 
in-use / checked-out.
@throws IOException thrown if an IO or access error occurs.
Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFolderData.java