Hardcode T1blood for some field strengths and use Zhang 2013 formula for others

[tsalo]

Closes #239.

Changes proposed in this pull request

• For 1.5T and 3T data, set T1blood from Alsop 2015 (1.35 and 1.65, respectively). For other field strengths, use the Zhang 2013 formula.

[codecov-commenter]

Codecov Report

Patch coverage: 63.48% and project coverage change: +0.50 🎉

Comparison is base (b1a516b) 45.09% compared to head (a5282b3) 45.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
+ Coverage   45.09%   45.59%   +0.50%     
==========================================
  Files         129      132       +3     
  Lines       12302    12465     +163     
==========================================
+ Hits         5548     5684     +136     
- Misses       6754     6781      +27     

Impacted Files	Coverage Δ
aslprep/interfaces/ge.py	24.35% <0.00%> (-1.26%)	⬇️
aslprep/workflows/base.py	88.60% <ø> (ø)
aslprep/tests/test_cli.py	72.58% <10.52%> (-27.42%)	⬇️
aslprep/workflows/asl/cbf.py	59.17% <36.25%> (-0.43%)	⬇️
aslprep/workflows/asl/gecbf.py	14.65% <42.85%> (+1.01%)	⬆️
aslprep/workflows/asl/qc.py	54.38% <54.38%> (ø)
aslprep/interfaces/cbf_computation.py	69.25% <62.16%> (-2.70%)	⬇️
aslprep/workflows/asl/plotting.py	65.45% <65.45%> (ø)
aslprep/utils/misc.py	66.27% <77.77%> (+2.72%)	⬆️
aslprep/tests/test_interfaces_cbf_computation.py	100.00% <100.00%> (ø)
... and 1 more

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