BUG: Fix misalignment of columns added to confounds matrix #403
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The construction of the confounds matrix mixes pandas concat methods with direct addition of columns - the latter does not respect indices. Adding a call to sort_index reorganizes the FD / motion confounds data frame such that the indices are sequential. This means subsequent addition of columns with confounds['new_col'] = data work as expected, and the CSV file is written in the order most users would expect, with indices 0,1,...,N rather than 1,2,...N,0.
Fixes #397