private void removeAllFrom(Address fromAddr, int opIndex) {
		Reference[] refs = getReferences(fromAddr, opIndex);
		for (Reference ref : refs) {
			delete(ref);
		}
	}
Removes the external entry point at the given address
@param addr that address at which to remove the external entry point attribute.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/references/ReferenceDBManager.java