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

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.40%. Comparing base (17c2e67) to head (01389ac).
Report is 27 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    78.92%   78.40%   -0.53%     
===========================================
  Files           12       12              
  Lines         2634     2635       +1     
===========================================
- Hits          2079     2066      -13     
- Misses         555      569      +14     

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