usage of the public 'label& List::size()'.

IMO this method is much too dangerous to leave public - the different
signature is needed to avoid confusing the compiler.

  - Allow xfer to assume control of a pointer
  - Added xferCopy macro
  - Doxygen

Changed the access to derived properties to ensure the old-time level values are stored if required.

  - avoid mkdir except for a few directories
  - grouped settings and added comments
  - minor bugfix: $FOAM_INST_DIR/linux64/bin was in path (pre OpenFOAM-1.5)
  - local (non-exported) variables in lowercase

  - A simple container for objects of type \<T\> that can be used for
    transferring the contents rather than copying them.
  - The wrapped object of type \<T\> must implement a transfer() method.

  - let _foamAddPath and _foamAddLib handle ':'-separated variables
    This unfortunately gets the order backwards, but at least doesn't
    try making really stupid directory names

  TODO:
  - settings.csh still has the same bug
  - perhaps _foamAddExistingLib function (or with a switch) to avoid the mkdir