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- can stop producing content when the target number of entries has
  been reached.

- change return type to labelList instead an Xfer container.
  This allows return-value-optimization and avoids a surrounding
  allocation. This potentially breaks existing code.

- make PackedList and PackedBoolList moveable. Drop xfer wrappers.

- additional convenience constructors

- The unset() method never auto-vivifies, whereas the set() method
  always auto-vivifies. In the case where set() is called with a zero
  for its argument - eg, set(index, 0) - this should behave
  identically to an unset() and not auto-vivify out-of-range entries.

Always return void to avoid various bugs associated with automatic
type conversion.

Resolves request http://openfoam.org/mantisbt/view.php?id=1973

This reverts commit c5bea524.

This reverts commit b18f6cc1.

- support &= for UList<label>, UIndirectList<label>
- support set/unset for PackedList<1>

- previously using an '|=' or '^=' would increase the list size to
  match the RHS. Now it only increases to last bit set.

- limit bit-wise operations to addressable range for minor efficiency
  improvement

- trim results from '&' and '^' operations for more consistent
  behaviour

ENH: adjust internal storage of PackedList to ensure that all unused
     internal storage elements are guaranteed to always be bit-wise
     zero. This makes the PackedBoolList implementation easier, and
     also greatly eases much of the book-keeping.
     Bits are now also zeroed on PackedList::clear()

Note: in PackedList, require packing at least 2 items otherwise it is
     more efficient to use a normal list.