fixed legend for non-faceted graphs; added shared-axis-label feature

[Magnus167]

The new behaviour implies that faceted graphs will not have a legend printed; since they would have only 1 XCAT with multiple CIDS, or vice-versa.

To understand the shared-axis-labels behaviour, view the last two example calls to pnl.plot_pnls() in naive_pnl.py:

pnl.plot_pnls(  pnl_cats=["PNL_GROWTH_NEG"], 
                pnl_cids=cids,
                facet=True,
                xcat_labels=None
                )
# new options : 
pnl.plot_pnls(  pnl_cats=["PNL_GROWTH_NEG"], 
                same_y=True,
                pnl_cids=cids,
                facet=True,
                xcat_labels=None,
                share_axis_labels=False,
                x_axis_label='Date',
                y_axis_label='PnL',
                y_label_adj=0.1,)
                    

[codecov-commenter]

Codecov Report

Base: 59.03% // Head: 59.21% // Increases project coverage by +0.18% 🎉

Coverage data is based on head (53ab1a1) compared to base (5724b92).
Patch coverage: 5.55% of modified lines in pull request are covered.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #650      +/-   ##
===========================================
+ Coverage    59.03%   59.21%   +0.18%     
===========================================
  Files           28       29       +1     
  Lines         2990     3050      +60     
===========================================
+ Hits          1765     1806      +41     
- Misses        1225     1244      +19     

Impacted Files	Coverage Δ
macrosynergy/pnl/naive_pnl.py	55.90% <5.55%> (-1.25%)	⬇️
macrosynergy/panel/linear_composite.py	77.35% <0.00%> (ø)

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