Minimum openHistorian 1.0 file size

[StephenCWills]

The openHistorian 1.0 archive is organized into data blocks that each contain one or more data points for a given signal. The archive will roll over to a new file when it is unable to allocate a new data block for a data point that it is attempting to archive. This means that an archive's file size needs to be adjusted so that each archive file has enough space to allocate at least one data block for each signal that is destined for that archive; otherwise, the archive will rapidly generate an explosion of nearly empty archive files.

LocalOutputAdapter.OptimizeLocalHistorianSettings() has a routine to adjust the file size for the STAT historian based on the number of data points destined for that archive. That way, the target file size for archive files scales up as the system does. Similar logic can be used to calculate a minimum "sane" file size for any openHistorian 1.0 archive.