More rollback problems: Fix two more errors introduced by checking (410) that

can cause database corruption after a ROLLBACK.  Also add new tests to make
sure everything is working this time. (CVS 663)

FossilOrigin-Name: f6e24d5ccbcfcf5863ffbd65860dafa2f5663e99

www/changes.tcl

@@ -25,6 +25,12 @@ proc chng {date desc} {
   puts "<DD><P><UL>$desc</UL></P></DD>"
 }
 
+chng {2002 Jly 7 (2.5.6)} {
+<li>Fix more problems with rollback.  Enhance the test suite to exercise
+    the rollback logic extensively in order to prevent any future problems.
+    </li>
+}
+
 chng {2002 Jly 6 (2.5.5)} {
 <li>Fix a bug which could cause database corruption during a rollback.
     This bugs was introduced in version 2.4.0 by the freelist