Introduce output info class to support KPI flag

Renamed InputSlotMap to InputSlotInfo

Introduced multilayer computation

Introduces fast declaration style for factory

Added missing workflow writer elimination of traits_version

Added more logging

Removed __traits_version__ from model getstate

Added indentation to json output for better readability

Removes the __traits_version__ when dumping the state with __getstate__()

Introduced log file option

Bumping version to 0.2.0.dev0