FIX: pass scheme to call of MultiCompartmentSphericalHarmonicsModel

[matteofrigo]

This commit changes the behaviour of the simulate_signal and the __call__ function of instances of the MultiCompartmentSphericalHarmonicsModel class by changing the _construct_convolution_kernel method.

Before this commit, the acquisition scheme employed by the method was the one contained in the self.scheme attribute. After applying this commit, the employed acquisition scheme is the one passed as the keyword argument acquisition_scheme= to the method. If it is not passed, the function will use the one contained in self.scheme for backward compatibility.

[coveralls]

Pull Request Test Coverage Report for Build 599

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 82.417%

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Files with Coverage Reduction	New Missed Lines	%
dmipy/distributions/tests/test_bingham.py	1	95.89%
dmipy/utils/tests/test_spherical_convolution.py	1	95.35%
<!--	Total:	2		-->

Totals
Change from base Build 594:	-0.2%
Covered Lines:	4699
Relevant Lines:	5545

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #85 into master will decrease coverage by 0.06%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
- Coverage    81.7%   81.64%   -0.07%     
==========================================
  Files          64       64              
  Lines        5543     5545       +2     
  Branches      655      656       +1     
==========================================
- Hits         4529     4527       -2     
- Misses        840      842       +2     
- Partials      174      176       +2

Impacted Files	Coverage Δ
dmipy/core/modeling_framework.py	71.21% <100%> (+0.05%)	:arrow_up:
dmipy/utils/tests/test_spherical_convolution.py	95.12% <0%> (-4.88%)	:arrow_down:
dmipy/distributions/tests/test_bingham.py	95.52% <0%> (-2.99%)	:arrow_down:

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