03a8fa9ca9
- 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