SE-EPI T1 Acquisition Orders

[alexdaniel654]

Proposed changes

Currently ukat only supports ascending slice acquisition orders i.e. ukat assumes the zeroth slice was acquired first, next slice tss later, the next slice 2 x tss later etc. This isn't always the case. In descending acquisitions, the -1th slice is acquired first, the -2th slice tss later etc and in centric acquisitions the slice acquisition order is [4, 2, 0, 1, 3] for a five slice acquisition. ukat should support these options and, ideally, custom acquisition orders.

Checklists

• I have read and followed the CONTRIBUTING document
• This pull request is from and to the dev branch
• I have added tests that demonstrate the feature/fix works
• I have added necessary documentation (if appropriate)
• I have updated documentation which becomes obsolete after my changes (if appropriate)
• I have added/updated a notebook to demonstrate the changes (if appropriate)
• Files added follow the repository structure (if appropriate)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.97%. Comparing base (d2b78c9) to head (2a866a0).
Report is 9 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #238      +/-   ##
==========================================
+ Coverage   97.94%   97.97%   +0.02%     
==========================================
  Files          48       48              
  Lines        4534     4588      +54     
==========================================
+ Hits         4441     4495      +54     
  Misses         93       93              

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