Mark OLESEN authored Mar 05, 2021 and Andrew Heather committed Mar 16, 2021

- support selective enable/disable of the file banner.

ENH: improve code isolation for decomposedBlockData

- use readBlockEntry/writeBlockEntry to encapsulate the IO handling,
  which ensures more consistency

- new decomposedBlockData::readHeader for chaining into the
  block header information.

- remove unused constructors for decomposedBlockData

ENH: minor cleanup of collated fileOperations