Start indices

[amoodie]

Relocates initialization of start indices from get_inlet_weights_water to init_water_iteration methods, allowing the weights and start indices to be modified by existing hooking approaches. No change to default functionality.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.80%. Comparing base (16e776b) to head (982980e).
⚠️ Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
pyDeltaRCM/water_tools.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #285      +/-   ##
===========================================
+ Coverage    78.49%   78.80%   +0.30%     
===========================================
  Files           12       12              
  Lines         2674     2675       +1     
===========================================
+ Hits          2099     2108       +9     
+ Misses         575      567       -8     

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