Loss function API
Adapt to new API for loss function in factors (MR 331 in core):
-
Factors: constructor (and emplace) does not have
processor_ptrandapply_loss_functiondefault values anymore. -
Processors: new
apply_loss_functioninParamsProcessorBaseto be used when emplacing factors. -
YAML: add parameter
apply_loss_functionfor processors (false)