Meta fix (addresses issue #290)

[jmumford]

This addresses issue

• Consider pymare for meta-analysis nodes #290

The 'meta' option for SecondLevelModel will now run a pymare based estimators.WeightedLeastSquares() analysis.

I have tested on nifti and cifti data, the 'meta' and 'glm' options, for design matrices using only an intercept or with a regressor that requires an events.tsv file. Most tests focused on single subject analyses, averaging data within-subject across runs. My addition to setup.cfg to install pymare was not tested and should be checked.

Pull request is ready for review.

[pep8speaks]

Hello @jmumford, Thank you for updating!

• In the file fitlins/interfaces/nistats.py:

Line 346:1: W293 blank line contains whitespace
Line 371:1: W293 blank line contains whitespace
Line 434:22: W291 trailing whitespace

• In the file fitlins/interfaces/pymare_extension.py:

Line 14:1: W293 blank line contains whitespace
Line 16:1: E303 too many blank lines (3)

To test for issues locally, pip install flake8 and then run flake8 fitlins.