Updated table node to use status (1:not_published, 2:published, 3:trash )instead of deleted_at to implement soft deletes.

Updated queries to use the new status field.
Updated CMS_NODE with a new status attribute.

examples/demo/site/scripts/node.sql

@@ -12,7 +12,7 @@ CREATE TABLE "nodes"(
   "publish" DATETIME,
   "created" DATETIME NOT NULL,
   "changed" DATETIME NOT NULL,
-  "deleted_at" DATETIME NULL
+  "status"  INTEGER
 );
 
 CREATE TABLE page_nodes(