[FIX] mat 7.3 support for SPM.mat files

[adamnarai]

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Summary

Fixes #2162 Fixes #3432

List of changes proposed in this PR (pull-request)

• Replace sio.loadmat with a load function specific for SPM.mat files, so it also supports >2 GB mat 7.3 HDR files
• Fix MATLAB's test_run_interface which I also encountered while running the tests

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 5.00000% with 38 lines in your changes missing coverage. Please review.

Project coverage is 70.46%. Comparing base (e03ab6f) to head (bd0d585). Report is 187 commits behind head on master.

Files with missing lines	Patch %	Lines
nipype/utils/filemanip.py	2.77%	35 Missing :warning:
nipype/interfaces/spm/model.py	33.33%	2 Missing :warning:
nipype/interfaces/tests/test_matlab.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3650      +/-   ##
==========================================
- Coverage   70.83%   70.46%   -0.37%     
==========================================
  Files        1276     1277       +1     
  Lines       59320    59153     -167     
  Branches     9826     8590    -1236     
==========================================
- Hits        42019    41685     -334     
- Misses      16125    16340     +215     
+ Partials     1176     1128      -48     

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