nipype.interfaces.dcm2nii.Dcm2nii() leaves a config.ini after running

[dmd]

When nipype.interfaces.dcm2nii.Dcm2nii() is run, it creates a config.ini in its working directory, because of the call to _gen_filename() in nipype/interfaces/dcm2nii.py.

It would be polite for it to clean up after itself rather than leaving this file in place.

[blakedewey]

This should be closed by merging in #1132.

[blakedewey]

Closed with #1132.