Support no smoothing when set custom boundary for XYZ contour.

Version: 2018

Type: Features

Category: Graphing

Subcategory: Contour

Jira: ORG-16525

In Origin 2018, user can uncheck Smoothing checkbox when using Custom Boundary.

Before Origin 2018, the checkbox couldn't be unchecked so there was always some smoothing effect. Workaround: Set system variable @tcs=0 to minimize the number of smoothing data points