sbool deleteLocalSnippet(S snippetID) {
  File f = localSnippetFile(snippetID);
  if (!fileExists(f)) false;
  File backupDir = localSnippetsDir("Deleted");
  moveFileToDirVerbose(f, backupDir);
  moveFileToDirVerboseIfExists(fileInfoFile(f), backupDir);
  true;
}