Draft: Make the 'lagrange' parameter of 'vec_jac' const

[osander1]

It is the adjoint vector of a reverse sweep, and should not be changed.

For some reason this vector is changed once, though: It is overwritten by zeros in fo_rev.c:742. That needs to be understood/fixed before this MR can be merged.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 65.57%. Comparing base (3c1f1ed) to head (04f0c56).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
ADOL-C/src/fortutils.c	0.00%	2 Missing ⚠️
ADOL-C/src/fo_rev.c	0.00%	1 Missing ⚠️
ADOL-C/src/interfacesf.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   66.25%   65.57%   -0.68%     
==========================================
  Files          51       51              
  Lines       26686    26162     -524     
  Branches     1843     1843              
==========================================
- Hits        17680    17156     -524     
  Misses       9006     9006              

Flag	Coverage Δ
unittests	65.57% <0.00%> (-0.68%)	⬇️

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