Reading freesurfer stats files correctly

[simkarwin]

[effigies]

A couple thoughts:

1. Why a class with only static methods? I think flat functions would make more sense and be consistent with this module.

2. Is it possible to do what you want with plain numpy? Pandas is a very heavy dependency that we are unlikely to make an installation requirement.

[simkarwin]

The code has been revised regard to your comments

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 35.71429% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.33%. Comparing base (276f786) to head (02334f4).

Files with missing lines	Patch %	Lines
nibabel/freesurfer/io.py	35.71%	9 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1152      +/-   ##
==========================================
- Coverage   95.36%   95.33%   -0.03%     
==========================================
  Files         207      207              
  Lines       29680    29694      +14     
  Branches     4992     4996       +4     
==========================================
+ Hits        28305    28310       +5     
- Misses        935      944       +9     
  Partials      440      440              

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[effigies]

@simkarwin Sorry about the long radio silence. Any interest in finishing this up?