sbool deleteLocalSnippet(S snippetID) {
  File f = localSnippetFile(snippetID);
  if (!fileExists(f)) false;
  File backupDir = localSnippetsDir("Deleted");
  moveFileVerbose(f, makeFileNameUnique(newFile(backupDir, f.getName())));
  moveFileVerboseIfExists(fileInfoFile(f), makeFileNameUnique(newFile(backupDir, fileInfoFile(f).getName())));
  true;
}