Solution: fix pH charge balancing bug and possible water ion imbalance

[rkingsbury]

[1.1.3] - 2024-07-28

Fixed

• Solution: Fix a bug in which setting balance_charge to pH could result in negative concentration errors when charge balancing or after equilibrate was called. Solution now correctly enforces the ion product of water (Kw=1e-14) whenever adjusting the amounts of H+ or OH- for charge balancing.

Added

• Solution._adjust_charge_balance: Added a privat helper method to consolidate charge balancing code used in __init__ and equilibrate.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.62500% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.93%. Comparing base (8bef6a4) to head (0e0ee6a). Report is 1 commits behind head on main.

Files	Patch %	Lines
src/pyEQL/solution.py	90.32%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #154 +/- ## ========================================== + Coverage 82.64% 82.93% +0.29% ========================================== Files 9 9 Lines 1469 1483 +14 Branches 322 320 -2 ========================================== + Hits 1214 1230 +16 Misses 216 216 + Partials 39 37 -2 ```

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