v2.8.0 released (border style)

[kirchsth]

It is time for a new release v2.8.0!

The new main features is

• All element and boundary specific tags support $borderStyle and $borderThickness arguments
  (like the relationships with $lineStyle and $lineThickness)

UpdateElementStyle(...,?borderStyle, ?borderThickness)
AddElementTag(...,?borderStyle, ?borderThickness)
UpdateBoundaryStyle(...,?borderStyle, ?borderThickness)
AddBoundaryTag(...,?borderStyle, ?borderThickness)

I hope you like it