Bug fixes from v1.5 and some enhancements

• BUG fixes

  • near-zero bvalue handling
  • smoothing parameter

  Fixed #18, #19, #21

• /tmp-->tempfile.gettempdir()

Memory efficient, rewrite capable, structured output

1. dti_harm() is separated from preprocess()
2. --force is coupled with writing each file
3. statistics are exported to csv file
4. graph is provided to demonstrate goodness of dMRIharmonization

Functional pipeline

TBD:

i. Whole pipeline tests
ii. Unit tests
iii. Public test data

Initial release

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