- The capitalization is consistent with most other template classes, but
more importantly frees up xfer() for use as method name without needing
special treatment to avoid ambiguities.
It seems reasonable to have different names for transfer(...) and xfer()
methods, since the transfer is occuring in different directions.
The xfer() method can thus replace the recently introduced zero-parameter
transfer() methods.
Other name candidates (eg, yield, release, etc.) were deemed too abstract.
- removed operator* in favour of operator() for consistency with tmp
class. The previous use of operator() for const casting didn't work
anyhow due to template confusion.
- added xferCopy(), xferMove() and xferTmp() template functions instead
- preliminary changes to IOobjects and Fields for xfer
