ENH: extend bitSet functionality

- num_blocks(), test_set() as per boost
- broadcast(), reduceAnd(), reduceOr() to simplify parallel operations
- matrix-like output for PackedList::writeList()

BUG: Pstream::broadcastList() missing resize on sub-ranks

- latent bug since it was unused in any OpenFOAM code

applications/test/bitSet2/Test-bitSet2.cxx

@@ -137,11 +137,11 @@ inline bool compare
     const std::string& expected
 )
 {
-    const List<unsigned int>& store = bitset.storage();
+    const auto& store = bitset.storage();
 
     std::string has;
 
-    for (label blocki=0; blocki < bitset.nBlocks(); ++blocki)
+    for (label blocki=0; blocki < bitset.num_blocks(); ++blocki)
     {
         has += toString(store[blocki]);
     }