Bugfix: linear_composite(), added pass-through for normalize_weights arg

[Magnus167]

Modifies default behaviour

Currently the underlying functions linear_composite_on_xcat() & linear_composite_on_cid() have arguments for normalize_weights. However, the call to these functions had the flag hardcoded. This arg has now been added to the wrapper, with a pass-through.
Another bugfix - some arguments are modified before being passed to the backend. There is a .copy() to prevent modifying them outside the current scope.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (13506d7) 73.52% compared to head (8d41321) 73.56%.

❗ Current head 8d41321 differs from pull request most recent head cd8acc6. Consider uploading reports for the commit cd8acc6 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #890      +/-   ##
===========================================
+ Coverage    73.52%   73.56%   +0.03%     
===========================================
  Files           31       31              
  Lines         3804     3809       +5     
===========================================
+ Hits          2797     2802       +5     
  Misses        1007     1007              

Impacted Files	Coverage Δ
macrosynergy/panel/linear_composite.py	74.60% <100.00%> (+1.04%)	⬆️

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