The purpose of this class is to allow the contents of an MSPDI file
to be compared to the contents of an MPP file.
The anticipated use of this functionality is to ensure that where we have
an example MPP file, we can generate an MSPDI file from it using the
most recent version of MS Project, then we can ensure that we get
consistent data from both files when they are compared.
This is designed to be used as part of the regression testing suite.