doc-src/TutorialI/Rules/ROOT.ML

some updates concerning current Proof General 4.x, which lacks X-Symbol mode of 3.x;
removed historic note about Poly/ML vs. SML/NJ;

use_thy "Basic";
use_thy "Blast";
use_thy "Force";
use_thy "Forward";
use_thy "Tacticals";

use_thy "find2";