Incorrect parsing when more than 10 URLs or E-mails exists

Hello,

In delicious.inc:_delicious_tag_string(), the code for protecting all URLs/Emails temporarily before parsing was creating weak tokens that could be easily confused later when replacing them back. Here is what happens:

The code protects all URLs/Emails by using temporary tokens for them, the tokens look like this:

If you notice, the first token (__delicious_processing_replacement_1) will mistakingly match also the last ones. So this currently happens when you have more then 10 URLs/Emails in the body of the node being processed with delicious.

Attached a simple patch which fixes this by using md5() to hash the URLs/Emails instead of the simple increment.