Minor fix in datacard functions

[ywan2]

datacard_tools.py is updated for:

• new topcoffea scalings function parsing.
• asimov datacard fix function fix.

As for changing the datacard WC values, it's still subject to better changes.

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 9 lines in your changes missing coverage. Please review.

Project coverage is 25.34%. Comparing base (3471b74) to head (f659568).

Files with missing lines	Patch %	Lines
topeft/modules/datacard_tools.py	18.18%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
- Coverage   25.43%   25.34%   -0.10%     
==========================================
  Files          35       35              
  Lines        5185     5189       +4     
==========================================
- Hits         1319     1315       -4     
- Misses       3866     3874       +8     

Flag	Coverage Δ
unittests	25.34% <18.18%> (-0.10%)	⬇️

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[bryates]

@Andrew42 did you have any comments on this PR?

[anpicci]

@bryates, do you think we should ping Andrew privately about this PR?

[bryates]

@bryates, do you think we should ping Andrew privately about this PR?

@ywan2 looks like there is now a merge conflict in this PR. Can you fix it?