IATS payment processor type initialization

Currently, Alan Dixon has provided manual instructions for creating the IATS payment processor type database entry. All other Payment Processors are included in the data loaded at install time. Attached is a patch that inserts an IATS record into civicrm_payment_processor_type at installation. NB: Alan should certify that it is working properly. Alan, FYI I included both User Name and Password text so that those fields would show up. I believe your instructions assume that the password field is there, and every other processor uses the User Name field so I thought it might be good to just display it until you indicate that it shouldn't be there. My sense from the database is that you have used the Signature Label field where other processor plug-ins have used the User Name field, so it might be tidier to switch, but I'll leave that up to you.

To test this you'll probably want to do an svn install in order to generate the sql using GenCode.php.