Throw Error for Degenerate Histogram Names

[Laurie Nevay]

rebdsim should throw an exception / error when a degenerate histogram is declared in the analysisConfig file before continuing.

Need to keep a set of names and check on the count.

[Laurie Nevay]

Fix Issue #323. Prevent degenerate histogram names in rebdsim analysis configuration file.

→ <<cset 785a5f2efb67>>