current vs former, authors and editors

> #### Editors:
> Olaf Hartig
> Andy Seaborne
> Ruben Taelman
> Gregory Williams
> Thomas Pellissier Tanon
> #### Former editors:
> Steve Harris
> Andy Seaborne
> Eric Prud'hommeaux

Any given editor or author should only be listed as current _or_ former, not both (note "Andy Seaborne", above).