+ Preserve starting value if no evaluations were finite

+ Separately track the best minor and major estimate. This change
  ensures that we always move to the best point found during the line
  search even when the best point is not the last point. We also avoid 1
  fit and gradient evaluation by moving the major iteration convergence
  check above the switch statement.

+ Treat failure to find a search direction as convergence

+ Only update minor during line search

+ Unconfuse code that returns the converged details

+ Rename 'x' to 'theSpot'. I loath single letter variable names. X marks
  the spot.