Show Error Message of Affected Source File

In the `scount` application, in addition to the general error message when executing counting operations, also show the error message and error code collected by the individual `RcnSourceFile` that has an error, in the [reportError()](https://github.com/raven-computing/reckon/blob/22ecf2d961ba74a3ec289d0b3fbf8e7d30c7c080/src/scount/c/statistics.c#L24) function.