Change computerProgram 'version' to 'versionNumber'

And use 'version' instead of 'itemVersion' for object version for items

Also add deferred foreign key checking to system.sql so that DROP TABLE
commands don't fail mid-transaction

resource/schema/system.sql

@@ -1,4 +1,4 @@
--- 31
+-- 32
 
 -- Copyright (c) 2009 Center for History and New Media
 --                    George Mason University, Fairfax, Virginia, USA
@@ -23,6 +23,7 @@
 -- This file creates system tables that can be safely wiped and reinitialized
 -- at any time, as long as existing ids are preserved.
 
+PRAGMA defer_foreign_keys = true;
 
 -- Valid item types ("book," "journalArticle," etc.)
 DROP TABLE IF EXISTS itemTypes;
@@ -295,7 +296,7 @@ INSERT INTO fields VALUES (77,'runningTime',NULL);
 INSERT INTO fields VALUES (78,'network',NULL);
 INSERT INTO fields VALUES (79,'postType',NULL);
 INSERT INTO fields VALUES (80,'audioFileType',NULL);
-INSERT INTO fields VALUES (81,'version',NULL);
+INSERT INTO fields VALUES (81,'versionNumber',NULL);
 INSERT INTO fields VALUES (82,'system',NULL);
 INSERT INTO fields VALUES (83,'company',NULL);
 INSERT INTO fields VALUES (84,'conferenceName',NULL);
@@ -1185,3 +1186,5 @@ INSERT INTO "syncObjectTypes" VALUES(4, 'search');
 INSERT INTO "syncObjectTypes" VALUES(5, 'tag');
 INSERT INTO "syncObjectTypes" VALUES(6, 'relation');
 INSERT INTO "syncObjectTypes" VALUES(7, 'setting');
+
+PRAGMA defer_foreign_keys = false;