[svn r12873] Prepare database migration script for 1.8.3 to 1.8.4

main/install/migrate-db-1.8.3-1.8.4-pre.sql

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+-- This script updates the databases structure before migrating the data from
+-- version 1.8.3 to version 1.8.4
+-- it is intended as a standalone script, however, because of the multiple
+-- databases related difficulties, it should be parsed by a PHP script in
+-- order to connect to and update the right databases.
+-- There is one line per query, allowing the PHP function file() to read
+-- all lines separately into an array. The xxMAINxx-type markers are there
+-- to tell the PHP script which database we're talking about.
+-- By always using the keyword "TABLE" in the queries, we should be able
+-- to retrieve and modify the table name from the PHP script if needed, which
+-- will allow us to deal with the unique-database-type installations
+--
+-- This first part is for the main database
+-- xxMAINxx
+
+-- xxSTATSxx
+
+-- xxUSERxx
+
+-- xxCOURSExx