rename column to col

git-svn-id: https://linkchecker.svn.sourceforge.net/svnroot/linkchecker/trunk/linkchecker@977 e7d03fd6-7b0d-0410-9947-9c21f3af8025

create.sql

@@ -1,4 +1,5 @@
 -- tested with postgresql
+-- you can add a unique sequence id to the table if you want
 
 drop table linksdb;
 
@@ -14,7 +15,7 @@ create table linksdb (
     valid          int,
     url            varchar(50),
     line           int,
-    colum          int,
+    col            int,
     name           varchar(50),
     checktime      int,
     dltime         int,