As of 6.1.1 serialization of similar objects that derives from Command class is broken into two parts:
- serialization in dbcon/joblist, e.g. ColumnCommandJL::createCommand()
- deser in primitives/primproc, e.g. ColumnCommand ctor.
This layout complicates ser/des changes so that this functionality must be separated into a translation unit stored in ./utils/serialization.