Further work

@rgrp 
What should be our next immediate goals ?
Like, in the code itself we have:

```
    TODO: support for quarters e.g. Q4 1980 or 1954 Q3
    TODO: support latin stuff like M.DCC.LIII
    TODO: convert '-' to '?' when used that way
```

Please, guide me a little. After which, I can take that on myself.
