Helices that become smaller with every turn are geometrically perfectly valid. Therefore we cannot forbid this.
(For example when creating a helix from a face you often cannot move it so that you can apply a positive growth.)
- Helix: the property Turns has the App::PropertyFloatConstraint thus also the pointer to it must have the same property
- LinearPattern and Helix: make constraints static class member (forgot this in commit 114bdf6b)
- Draft: make the constraint const
- PolarPattern and LinearPattern assure that the header file is loaded at last to avoid potential troubles
These features, based on the code for the Pipe class, allow the user
to simply create a helical sweep within PartDesign workbench.
Sample application is threads, springs, coils, augers, etc.
Also, remove needless requirement for positive cone angle on helixes.
Thanks to @bitacovir for helping with the icons
Thanks to @chennes for review
Thanks to @vosk for review
Thanks to @wwmayer for review
Enforce that links stay within scope for ProfileBased features
This also ensures that the Body itself is not used for creating features within
the body, causing a "Graph not a DAG" error.
