// function returns source of forwarded-to page which is kind of not helpful
// (among other things, it says "not logged in")
sS addTagToSnippet(S snippetID, S tag) {
  ret loadPageWithParams(tb_mainServer() + "/tb/add-tag.php",
    mapPlus(standardCredentialsMap(), id := psI(snippetID), +tag, doit := 1));
}