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.
This changes nothing from the previous behaviour, however, this allows
to use rStatAnalysis as a post-processing tool. A demo case will follow
to demonstrate this.
By default, the data base is located in $CASE_DICT/dataBase. By specifying
the case dict as the path to the data base, rStatAnalysis can now act on
the case's actual time steps, thus post-processing data computed by another
solver.
The equation was probably taken from the paper of Kurose and Komori
1999, which does not repoduce the original formula given by Mei 1992
correctly (which itself is missing a left parenthesis).
The correct formula can be looked up for example in Mei and Klausner
1994 or Loth and Dorgan 2009
