Please, let me have done this correctly this time.

sql/database-create.sql

@@ -1011,7 +1011,6 @@ CREATE TABLE `experiment_templates` (
   `path` tinytext,
   `maximum_nodes` int(6) unsigned default NULL,
   `minimum_nodes` int(6) unsigned default NULL,
-  `virtnode_count` int(6) unsigned default NULL,
   `logfile` tinytext,
   `logfile_open` tinyint(4) NOT NULL default '0',
   `prerender_pid` int(11) default '0',
@@ -1060,6 +1059,7 @@ CREATE TABLE `experiments` (
   `state` varchar(16) NOT NULL default 'new',
   `maximum_nodes` int(6) unsigned default NULL,
   `minimum_nodes` int(6) unsigned default NULL,
+  `virtnode_count` int(6) unsigned default NULL,
   `testdb` tinytext,
   `path` tinytext,
   `logfile` tinytext,

sql/updates/4/177

@@ -10,7 +10,8 @@ sub DoUpdate($$$)
 
     if (!DBSlotExists("experiments", "virtnode_count")) {
 	DBQueryFatal("alter table experiments add ".
-		     "virtnode_count int(6) unsigned default NULL");
+		     "virtnode_count int(6) unsigned default NULL ".
+		     "after minimum_nodes");
     }
     return 0;
 }

sql/updates/4/179

+#
+# This file intentionally does nothing. Leave it be.
+#
+use strict;
+use libdb;
+
+sub DoUpdate($$$)
+{
+    my ($dbhandle, $dbname, $version) = @_;
+
+    return 0;
+}
+1;