Added ability to Omit fields from the HTML form

[Nick DeNardis]

This just in, we have added another parameter to the Form() function
that when passed an array of field names will omit them from the form
when output or submitted. This is crucial when you have as a password
field that you would like to stay private or if you have multiple
fields in the same form with the same name, like "user_id". You can now
hide the ones that are not necessary.

New Function Prototype:
function Form($display='', $hidden=array(), $options=array(),
$config=array(), $omit=array());