enable profiling output for postProcess and -postProcess

Like most utilities, these two don't use the normal run() mechanism - so there is no profiling output possible.

• fix by adding an explicit print, but only report the profiling to the log file from master process. We don't wish to overwrite any profiling that was conducted during the simulation. Besides which, we don't have a proper Time object for handling the write nicely either.

@Prashant - this is the first solution. Please see if it is adequate.

STYLE: could discuss trimming down the cpu/sys information. It doesn't seem to make much sense to write it every time.