public final ProgramFragment createFragment(String fragmentName, Address start, long length)
			throws DuplicateNameException, NotFoundException {
		ProgramModule module = currentProgram.getListing().getDefaultRootModule();
		return createFragment(module, fragmentName, start, length);
	}
Creates a fragment in the root folder of the default program tree.
@param fragmentName the name of the fragment
@param start the start address
@param length the length of the fragment
@return the newly created fragment
@throws DuplicateNameException if the given fragment name already exists
@throws NotFoundException if any address in the fragment would be outside of the program
Ghidra/Features/Base/src/main/java/ghidra/program/flatapi/FlatProgramAPI.java