Double Parameters Defaults, Increments, Mins and Maxs

In all cases double parameters' defaults, minimums and maximums are specified in the same space as the parameter, as is the increment in all cases but normalised parameters.

Normalised parameters specify thier increments in cannonical coordinates, rather than in normalised coordinates. So an increment of '1' means 1 pixel, not '1 project width', otherwise sliders would be a bit wild.