Display Error Messages at Top of Forms

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/05dbcea3d6368edd#

Hi guys,

we have a system to display error message near each field in error, but no
way to summarize all fields in error in form header message.
I suggest that we could retrieve fields in error inside error_message
element of forms.elm.tpl, which is something commonly seen all across the
net by the way :)

p