fix(plot_pathline): split recarray into particle list when it contains multiple particle ids

[jlarsen-usgs]

• update MfListBudget docstrings

Closes #1398

[codecov]

Codecov Report

Merging #1400 (2993ff9) into develop (cb8c219) will decrease coverage by 44.819%.
The diff coverage is 0.000%.

@@              Coverage Diff               @@
##           develop     #1400        +/-   ##
==============================================
- Coverage   74.865%   30.046%   -44.820%     
==============================================
  Files          249       249                
  Lines        53517     52080      -1437     
==============================================
- Hits         40066     15648     -24418     
- Misses       13451     36432     +22981     

Impacted Files	Coverage Δ
flopy/plot/map.py	7.605% <0.000%> (-75.918%)	⬇️
flopy/utils/mflistfile.py	50.684% <ø> (-20.422%)	⬇️
flopy/mf6/utils/testutils.py	0.000% <0.000%> (-93.334%)	⬇️
flopy/mfusg/mfusgsms.py	6.190% <0.000%> (-91.474%)	⬇️
flopy/mf6/utils/postprocessing.py	9.259% <0.000%> (-88.889%)	⬇️
flopy/modflow/mfevt.py	7.812% <0.000%> (-87.007%)	⬇️
flopy/mf6/utils/lakpak_utils.py	2.097% <0.000%> (-85.315%)	⬇️
flopy/modflow/mfhyd.py	13.223% <0.000%> (-85.124%)	⬇️
flopy/utils/swroutputfile.py	10.714% <0.000%> (-85.079%)	⬇️
flopy/utils/mtlistfile.py	4.620% <0.000%> (-84.700%)	⬇️
... and 206 more