Hi!

it seems that one of the post-"Merge pull request #249" updates to the codebase is forcing the load function of cifti2 to bring into memory the whole loaded matrix. For large files (I'm working on files of ~10Gb) this forces a "cannot allocate memory" exception.

I don't know how is it possible to add such large files to the test-base such that we can have a control for this. In any case it will be great if the error could be fixed.