Fix/afni stats

[chrisgorgo]

I have refactored (fixed) the ROIstat interface. I opted for list output instead of writing values to a file, but I'm open for discussion.

[bpinsard]

ok, maybe the option to output to a file would be useful,
I just ran into another problem, the output is cut if I ask for too many measures on too many ROIS from 3dROIstats, it seems that the length of stdout in nipype is limited to 20480, what could be the reason?

[satra]

this might come from limitations of capturing streaming output. i think in such cases where the output of the interface is from stdout, one should overwrite terminal_output to specifically be 'allatonce'. to make it clear to others that this interface is overriding the default setting, this should be done at the inputspec level.

    terminal_output = traits.Enum('allatonce', 
                                  desc=('Control terminal output: 
                                        '`allatonce` - waits till command is '
                                        'finished to display output'),
                                  nohash=True, mandatory=True, usedefault=True)

[pankajsingh88]

I want to echo bpinsard. An option to output to a file would be very useful.

[chrisgorgo]

I would prefer a more general solution for saving values to a file. I'm thinking along the lines of datasink creating json files when values instead of file paths are passed to it.

[chrisgorgo]

I reverted to saving everything to a file. @pankajsingh88 is this is what you had in mind?