Scale M0 scans with short TRs according to Alsop 2015

[tsalo]

Closes #530. I still need to modify the boilerplate, which means I need to extract the M0 TR in the workflow function instead of within a node.

Changes proposed in this pull request

Affected integration tests

• pcasl_multipld
• pcasl_singlepld_ge
• pcasl_singlepld_siemens
• qtab
• test_001
• test_002
• test_003

[tsalo]

@caugolm would you mind taking a look at this?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.16279% with 21 lines in your changes missing coverage. Please review.

Project coverage is 82.82%. Comparing base (8076479) to head (84b1df6).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
aslprep/utils/asl.py	38.23%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #532      +/-   ##
==========================================
- Coverage   83.15%   82.82%   -0.34%     
==========================================
  Files          38       38              
  Lines        4026     4069      +43     
==========================================
+ Hits         3348     3370      +22     
- Misses        678      699      +21     

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