Spnl migration to MValue
Revert "Spnl migration to MValue"

This reverts commit f723f1be3d342e0231b32e02b969f348d28d42ff.
Spnl data is in message data
MValue only for real parameters and metadata
Duplicate for migration for spnl data
Merge pull request #26 from wajam/olivier-mvalue-edge

MValue migration FINAL