Fix issue where an empty queue could be loaded
Remove 'devel' module from test
Genmap operations need to not send UPDATEs when there are no SF records

Generalized the operation calculation between salesforce_genmap and
salesforce_mapping, which exposed a problem in testing.  Needed to actually
send a record to Salesforce in order to properly test this entire feature.

BTW, sending CreatedDate and Name to Salesforce fails