PT-990 changes from text editor, same content
PT-990 - processing queue schema and db switching function
PT-990 - adding serial id fields to signatures schema
PT-990 - Improved comments in two places
Updated instructions, fortyfour version, and install Signatures Queue module.

	modified:   UPDATE.txt
	modified:   drupal-org.make
	modified:   modules/custom/petitions_maintenance/petitions_maintenance.install
PT-992 - Added preprocess signatures workflow.

	new file:   modules/custom/signatures_queue/includes/preprocess_signatures.inc
	modified:   modules/custom/signatures_queue/signatures_queue.admin.inc
Updated preprocess_signatures. Make worker_name and server_name optional params.

 	modified:   modules/custom/signatures_queue/includes/preprocess_signatures.inc
PT-992 - Added documentation and a few minor touch-ups.

	modified:   modules/custom/signatures_queue/includes/preprocess_signatures.inc
PT-992 - Removed check for shunt trip from preprocess_signatures.

  This gets checked now by signatures_queue_invoke_workflow().

	modified:   modules/custom/signatures_queue/includes/preprocess_signatures.inc