Remove aliases before simplifying DAE graph

[meggart]

Should strongly improve performance in some cases.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.61%. Comparing base (982963b) to head (454db44).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/DAT/xmap.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #571      +/-   ##
==========================================
+ Coverage   67.49%   67.61%   +0.12%     
==========================================
  Files          15       15              
  Lines        2215     2211       -4     
==========================================
  Hits         1495     1495              
+ Misses        720      716       -4     

Files with missing lines	Coverage Δ
src/DAT/xmap.jl	45.01% <0.00%> (+0.61%)	⬆️

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