#223527 by freso - added check to make sure that the passfield is filled out before the javascript does its hashing

basic changes to allow user to switch between cram mode and not.  I made these changes a while ago and forgot to commit, but they seem to work ok for now.

added menu settings allowing the site admin to choose defaults for cram login (not currently enforced)

replaced str_split(), which is a php5 only function, with preg_split. Now cram works in php5 and php4.

Big changes.  Changed 'challenge id' to be called nonce, which is a better term for what it is.  Also made it so the challenge id no longer depends on the userid.  Because of this, we can embed it directly into the form, which greatly simplifies the javascript.  This also allows us to log in during maintanence mode, which wasn't possible before.  The table schema changed so the module needs to be reinstalled to use the new schema.

#201114: cram.js was not working correctly on the user page.  The javascript is now activated for the correct form.

Initial commit of cram module.  CRAM implements the CRAM-MD5 algorithm as a Drupal Authentication method, allowing users to login to non-SSL secured sites without fear of their password being sent plaintext over the wire.