- the null output adapter was previously used for the HashTables API
when HashSet actually stored key/value. Now that the node only
contains the key, having suppressed output is redundant, as is the
zero::null class (reduces clutter)
STYLE: replace one::minus dispatch in extendedEdgeMesh
GIT: remove Foam::nil typedef (deprecated since May-2017)
ENH: add pTraits and IO for std::int8_t
STYLE: cull some implicitly available includes
- pTraits.H is included by label/scalar etc
- zero.H is included by UList
STYLE: cull redundant forward declarations for Istream/Ostream
GIT: primitives/compat with compatibility includes
GIT: primitives/traits with pTraits, contiguous, zero, one etc.
COMP: relocate base equal(a,b) definition from scalar.H -> label.H
- make more universally available
STYLE: replace occasional use of notEqual(a,b) with !equal(a,b)
