- Added central differencing option.
- Changed `mu` semantics from log10 to actual values.
- `mu` control is now more aggressive, saves a few iterations.
- Use Armijo sufficient reduction criterion.
- Added some checks for float64 and NaNs.
- Added log of final result to trace.
- Removed unhelpful QP timing.
PiperOrigin-RevId: 610096950
Change-Id: Idf1a7c3155ce8e82fc2d5fe0f2da2f16636ff63d