list of CPOs into a Single Chained OneChain a list of preprocessing operators, or retrafo objects, turning list(a, b, c) into
a %>>% b %>>% c.
This is the inverse of as.list.CPO / as.list.CPOTrained when applied to CPO or CPOTrained.
pipeCPO(pplist)[list of CPO | list of CPOTrained]
A list of CPO or CPOTrained objects.
[CPO | CPOTrained]. The compound CPO(Trained) obtained when chaining the elements
  of the input list.
Other operators: CPO, %>>%,
  applyCPO, as.list.CPO,
  attachCPO, composeCPO
Other retrafo related: CPOTrained,
  NULLCPO, %>>%,
  applyCPO, as.list.CPO,
  clearRI, getCPOClass,
  getCPOName,
  getCPOOperatingType,
  getCPOPredictType,
  getCPOProperties,
  getCPOTrainedCPO,
  getCPOTrainedCapability,
  getCPOTrainedState,
  is.retrafo,
  makeCPOTrainedFromState,
  print.CPOConstructor
Other inverter related: CPOTrained,
  NULLCPO, %>>%,
  applyCPO, as.list.CPO,
  clearRI, getCPOClass,
  getCPOName,
  getCPOOperatingType,
  getCPOPredictType,
  getCPOProperties,
  getCPOTrainedCPO,
  getCPOTrainedCapability,
  getCPOTrainedState,
  is.inverter,
  makeCPOTrainedFromState,
  print.CPOConstructor