No extra space after / or - when using /<U> and -<U> as axis unit.

Version: 2018

Type: Features

Category: Graphing

Subcategory: Axes

Jira: ORG-16446

Before Origin 2017, In Tools: Options ?Axis tab, when specifying unit separator as /<U>, or -<U>, an extra space shows after / or -.

In Origin 2018, by default no space will be added after / or -. User can manually set it as / <U>, or - <U> to add a space.

We will continue to have space before units separators by default. System variable @ATSS is added to control space before unit separator.

1: space before unit separator (default)
0: no space before unit separator