[SCIFIO] Minimal Service Setup for ImgOpener

[Johannes Schindelin]

Hi Curtis,

On Wed, 25 Sep 2013, Curtis Rueden wrote:

> P.S. The only slightly unintuitive thing (IMHO) is that non-core
> services should *not* extend SciJavaService, because that interface is
> intended for use by the org.scijava.* services *only*. (E.g.,
> SCIFIOService does not extend it.)

How about a warning in the ServiceHelper? It could detect if some service
whose class' name does not have the org.scijava. prefix but that
implements SciJavaService...

Ciao,
Dscho