Mark OLESEN authored Feb 19, 2021 and Andrew Heather committed Mar 16, 2021

- improves interface and data consistency.
  Older signatures are still active (via the Foam_IOstream_extras
  define).

- refine internals for IOstreamOption streamFormat, versionNumber

ENH: improve data alignment for IOstream and IOobject

- fit sizeof label/scalar into unsigned char

STYLE: remove dead code