ENH: Allow setting slice ordering for through scripting

Instead of requiring user input.
Whitespace.
BF: Pass slice order by setting the relevant mrSESSION field.
Merge pull request #76 from arokem/mrinit_slicetimes

Mrinit slicetimes
fixed what appeared to be an error in setting clobber. Now it should apropriately overwrite files if desired
made annoying figure outputs optional
For robust tensor fitting there are 2 ways to calculate the noise in the data. dtiInit now lets the user choose which method to use. These are corner or b0 and can be set in dtiInitParams
Merge branch 'master' of https://github.com/vistalab/vistasoft