New boards added

[Victor]

I have added some new boards. "Crisis of the 3rd Century" is for coins struck from 235- 284, which consist mostly of AR ants. These silver coins  might seem a departure from LRB's, but they are the precursors to the later bronze coinage, so it is a transitional period with a lot of overlap.

The Gallic Empire board is for coins from Postumus, Marius, Victorinus, Tetricus I, Tetricus II. Of course Laelianus and Domitianus, if you happen to find any examples.

The Byzantine Empire board is, of course, for coins from the Byzantine Empire. This is a wide range covering 1,000 years; but RIC X, though called Roman Imperial Coinage, has mostly Emperors that are considered Byzantine.

Any suggestions for boards or other ideas? I was debating a Britannic Empire board, but that is only two Emperors- Carausius and Allectus. Same for the Palmyrene Empire- Vaballathus and Zenobia.