Release March 15 - 2018

[ArtF]

Hi All:

  Development version has been updated to a Vexx version of 1.5
In the option is a selector for two versions of dxf output, one tested to work with
Fusion 360.
  Spirals now have an attenuation constant so degenerate spirals can be made, this
was a user request. No other canges other than several bug fixes.

Thx
Art

[BobL]

Thanks for the update Art..