Make SCIFIO First ImageIO if present

[hinerm]

If ITK already has an ImageIO that covers the same format as SCIFIO, it is queried first. But the data isn't guaranteed properly formatted for the SCIFIO writer. It would be nice to ensure that SCIFIO Writers are only invoked if given a SCIFIO ImageIO.. and one way to do that would be to just always make SCIFIO ImageIO the top choice.

[ctrueden]

My understanding is that reordering the discovered ImageIO handlers is not currently possible.

[hinerm]

Then we could add a check in the ImageIO::CanWrite method that verifies the image was read with the SCIFIOImageIO... or figure out what's actually organized differently between the native ITK imageIOs and SCIFIOImageIO and translate or fix it on the SCIFIO side..

[ctrueden]

Sounds good! The heuristic for "fixing" data which was generated from a source other than the SCIFIOImageIO will be limited, but we can do it on a best effort basis.

[ctrueden]

Took me a while to dig up the supporting reference for my claim, but here it is: http://www.itk.org/pipermail/insight-users/2012-July/045252.html.