This had been used in functionObjects:
Info(log)<< "messages" << data << ....
in which it is not at all clear what the "log" argument does whereas
if (log) Info<< "messages" << data << ....
is totally clear and more efficient.
Previous behavior which may be useful for moving-mesh cases can be
selected using the optional entry:
writeVolume yes;
The initial volume is written in the log and data file header e.g.:
# Source : all
# Cells : 3829
# Volume : 9.943164e-01
Also added
sumMag | sum of component magnitudes
