Changes throughout Moodle to remove any reserved words from the

Moodle tables.

ie user -> userid in many tables, plus in user_students
   start -> starttime and end -> endtime

I've just done all this as carefully as I could ... I don't think
I missed anything but it's pretty intensive work and I'd be fooling myself
if I didn't think I'd missed a couple.

Note that this version should pretty much be able to bootstrap itself
using PostgreSQL now ... but this is untested

mod/journal/db/postgres7.sql

@@ -32,7 +32,7 @@ CREATE TABLE journal (
 CREATE TABLE journal_entries (
   id SERIAL PRIMARY KEY,
   journal integer NOT NULL default '0',
-  "user" integer NOT NULL default '0',
+  userid integer NOT NULL default '0',
   modified integer NOT NULL default '0',
   text text NOT NULL default '',
   format integer NOT NULL default '0',