Why both record::Copy and record::CopyFrom?

Investigate why both forms exist.

Note CopyFrom does not copy status bytes.  This means (among other things) that ZNI -> ZNR copy does not preserve status bytes, so IsSet etc. do not work correctly on ZNR records.

CopyFrom is used in basAnc::del() to copy records over deleted basAnc slot.  Not copying status bytes seems wrong?

Consolidate if possible.