Applied Mattijs' PackedList improvements

- resize with factor 2 as per DynamicList

Old insertion speed:
    1000000 in 0.61 s
    2000000 in 2.24 s
    3000000 in 3.97 s
    4000000 in 5.76 s
    5000000 in 7.54 s
    6000000 in 9.41 s
    7000000 in 11.5 s

New insertion speed:
    1000000 in 0.01 s
    2000000 in 0.02 s
    3000000 in 0.01 s
    4000000 in 0.02 s
    5000000 in 0.01 s
    6000000 in 0.01 s
    7000000 in 0.01 s

src/OpenFOAM/containers/Lists/PackedList/PackedListI.H

@@ -670,7 +670,16 @@ inline void Foam::PackedList<nBits>::reserve
     // need more capacity?
     if (len > StorageList::size())
     {
-        StorageList::setSize(len, 0u);
+        // Like DynamicList with SizeInc=0, SizeMult=2, SizeDiv=1
+        StorageList::setSize
+        (
+            max
+            (
+                len,
+                StorageList::size()*2
+            ),
+            0u
+        );
     }
 }