Adding support for reading in a daily EIP file
Minor bugfix affecting bad filename usage

If filenames were specified for things like serotype and EIP data, but
appropriate files do not actually exist and therefore a filehandle cannot be
opened, an error message was sent on stderr, but the program would continue to
run, potentially segfaulting.  Appropriate behavior is to exit gracefully if
the user provides arguments that cannot be used for any reason.
Adding toy data sets (10e5 people) for testing code

Some of these files could be pruned further.  There are almost certainly
many empty locations that are being instantiated.