A bunch of minor changes.

1. Fix a typo in auto_diff_cost_function.h
2. Fix and update Solver::Summary::FullReport() text labels.
3. Add logging of the number of residual and jacobian evaluations
   to the full report. The GradientProblemSolver already does this.

Change-Id: I41059af5f0ebe0417accbbc30b0808a4b04b9edb

include/ceres/solver.h

@@ -844,9 +844,15 @@ class CERES_EXPORT Solver {
     // Time (in seconds) spent evaluating the residual vector.
     double residual_evaluation_time_in_seconds;
 
+    // Number of residual only evaluations.
+    int num_residual_evaluations;
+
     // Time (in seconds) spent evaluating the jacobian matrix.
     double jacobian_evaluation_time_in_seconds;
 
+    // Number of Jacobian (and residual) evaluations.
+    int num_jacobian_evaluations;
+
     // Time (in seconds) spent doing inner iterations.
     double inner_iteration_time_in_seconds;