BUG: Remove old debug code.
ENH: Tuner: Add widget to view and specify the metric space sampling.

A histogram of the values from the parameter progression is displayed in the
widget.
ENH: Tuner: action to center metric sampling on convergence.

Towards obtaining the true peak value.
ENH: Tuner: spinbox to specify metric sampling.
ENH: Improve metric surface rendering.
ENH: Tuner, add a line plot of the progression.
Merge pull request #246 from thewtex/domain-specification

Domain specification