Add an optional boolean switch to standardRecModel class to allow
ignoring the 0 directory when building the recurrence data base.
This is useful when using rStatAnalysis as a post-processing tool
on a case where OpenFOAM's purgeWrite feature was used.
If purgeWrite is set to 0, then all time steps will be written to disk.
If purgeWrite is set to N, then only the last N time steps will be stored.
As a new time step is written to disk, the oldest one will be discarded.
However, the 0 directory is excluded from removal.
If purgeWrite is set to 5, and we run a simulation with deltaT=1 und endTime=10,
then the time steps on disk will be: 0, 6, 7, 8, 9, 10.
Running rStatAnalysis on this case, will end in fatal error, as the time step
within the data base will be found to be non-uniform.
The quick and dirty fix, would be to remove or rename the 0 directory, so that
it does not get read. However, telling the recurrence model whether to include
0 or not seems the more elegant solution.
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