[FIX] Drop gifti support

[emdupre]

Closes #34.

Changes proposed in this pull request:

• Drops gifti support. Images must instead be tedana-denoised before projecting to the surface.

[codecov]

Codecov Report

Merging #114 into master will increase coverage by 0.33%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
+ Coverage   49.25%   49.58%   +0.33%     
==========================================
  Files          32       32              
  Lines        2067     2033      -34     
==========================================
- Hits         1018     1008      -10     
+ Misses       1049     1025      -24

Impacted Files	Coverage Δ
tedana/model/fit.py	28.38% <ø> (+0.23%)	⬆️
tedana/tests/test_utils.py	100% <100%> (ø)	⬆️
tedana/utils/utils.py	95.71% <100%> (+12.38%)	⬆️

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[emdupre]

@tsalo @rmarkello please let me know if you foresee any issues with merging this !

[tsalo]

Nothing jumps out at me in the code, and since tests are passing I think it should be good.

[emdupre]

Dropping gifti support is a little bit of an extreme response to the discussion in #34, but I think we agreed on gitter that this was the best course of action in the long run. Just trying to make sure I'm not misrepresenting / misremembering that discussion !!

[rmarkello]

As @tsalo said, nothing in the code strikes me as particularly concerning! And I think this is probably the right way forward, so 👍 from me.

[emdupre]

Great, thanks for the feedback ! Merging !