Update acquisition scheme and model handling for clinical data (deltas unknown)

[rutgerfick]

• [x] renames old gtab_dipy2mipy and gtab_mipy2dipy to be dmipy instead of mipy.
• [x] gtab_dipy2dmipy accepts gtabs without delta/Delta, but with warning.
• [x] dipy2dmipy gtabs without small_delta and big_delta pass None for these values in the AcquisitionScheme, but this can only be done with acquisition_scheme_from_bvalues().
• [x] removed superfluous _rotational_scheme() function in acquisition_scheme.py
• [x] gtab_dmipy2dipy gives error for acquisition schemes with multiple delta/Delta.
  • [x] assert that this error comes.
• [x] prune_acquisition_scheme function must also pass arguments of the original acquisition scheme w.r.t. b0 threshold and shell_distance, otherwise the pruned scheme can still have the right measurements, but be wrongly setup because of the default values.
  • [x] test for pruned function
• [x] acquisition_scheme accepts empty delta/Delta and the values are displayed in summary as N/A just as TE can be.
• [x] upon calling model.fit(scheme, data) AND simulate_data() the scheme is checked if it is compatible with the models, i.e., if the models need delta/Delta and it is not there, an appropriate error is given.
• [x] same for fitted models predict()
  • [x] add _required_acquisition_parameters to each compartment model
  • [x] add tests to check the raises when the wrong acquisition scheme is used
• [x] update acquisition scheme tutorial

closes #33

[codecov-io]

Codecov Report

Merging #34 into master will increase coverage by 0.53%. The diff coverage is 85.85%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   81.81%   82.35%   +0.53%     
==========================================
  Files          61       61              
  Lines        5136     5253     +117     
  Branches      579      614      +35     
==========================================
+ Hits         4202     4326     +124     
+ Misses        777      763      -14     
- Partials      157      164       +7

Impacted Files	Coverage Δ
dmipy/signal_models/cylinder_models.py	98.67% <100%> (+0.01%)	:arrow_up:
dmipy/tissue_response/white_matter_response.py	72.15% <100%> (ø)	:arrow_up:
dmipy/signal_models/tissue_response_models.py	97.8% <100%> (+0.04%)	:arrow_up:
dmipy/signal_models/gaussian_models.py	98.61% <100%> (+0.02%)	:arrow_up:
dmipy/signal_models/sphere_models.py	72.14% <100%> (+0.81%)	:arrow_up:
dmipy/signal_models/plane_models.py	100% <100%> (ø)	:arrow_up:
dmipy/distributions/distribute_models.py	78.85% <100%> (+0.49%)	:arrow_up:
dmipy/core/tests/test_acquisition_scheme.py	100% <100%> (ø)	:arrow_up:
dmipy/tissue_response/three_tissue_response.py	36.04% <50%> (ø)	:arrow_up:
dmipy/core/fitted_modeling_framework.py	64.75% <66.66%> (+0.01%)	:arrow_up:
... and 6 more

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