Better Logging and error handling of Migration of User Management

try
{
	migrator.migrate(migratorConfiguration, new HtmlJspWriterMigrationProgressListener(out));
	out.print("<p>Users and groups migrated successfully!</p>");
}
catch (DuplicateEntityException dee)
{
	out.println("<font color='red'><b>ERROR</b><br/><blockquote>" + dee.getMessage() + "</font><br/>");
	out.println("If you are upgrading from Confluence 2.1.x and have already performed this migration previously - <i>you do not need to perform this again</i>. You only need to move your settings over as outlined in <a href='http://confluence.atlassian.com/x/tp8C'>this document.</a><br/>");
	out.println("Otherwise, please ensure that in your: <pre>confluence/WEB-INF/classes/atlassian-user.xml</pre> file, that the hibernateRepository is first and the osuserRepository is second.<br/></blockquote>");
}
catch (RepositoryException repositoryException)
{
	out.println("<font color='red'><b>ERROR</b><br/><blockquote>" + repositoryException.getMessage() + "</font><br/>");
	out.println("Please ensure that at least one non OSUser repository configured.");
}

catch (EntityException entityException)
{
	out.println("<font color='red'><b>ERROR</b><br/><blockquote>" + entityException.getMessage() + "</font><br/>");
	out.println("Please log a support case. It appears that you have some users that have been defined in two repositories, e.g. in osuser and LDAP.");
}
catch (Exception exception)
{
	out.println("<font color='red'><b>ERROR</b><br/><blockquote>" + exception.getMessage() + "</font><br/>");
}