higher level exception handling on Windows
+ Handle empty system path in init script
Used new PropertyQuantity API in Draft & Arch - fixes #1414
Arch: fixed Continue mode
Updated sphinx files
Fixed Draft utilities menu
+ Avoid to unnecessarily throw Py::Exception
+ Minor fix in test feature
+ Fix for clang
Part: CheckGeometry: Mantis #0001427

    Store coin referenced pointer instead of viewprovider
+ fixes #0001429: don't apply booleans on null shapes
Draft: Fixed IsActive methods - fixes #1431
Arch: removed some debug output
Fixed a regression in wire.makePipeShell caused by commit d62ed23
+ Implement alternative to load ui files without using PySide's QtUiTools module
Add Draft Bezier Curve draw & edit mockup using bSpline tools.
Draft Bezier Curves: Add functionality to mockup
     - Split poles to multiple bezier segments
     - set degree of bezier curve
     - Close Draft bezier curves
     - set Degree at creation
     - implement addPoint for piecewise Bezier curves

Draft BezCurve bugfixes
    - fix Close button for BexCurve Edit
    - fix tracker behaviour in for BezCurve.undoLast

Draft Bezier Curve: use circle trackers for control points

Draft: prepare functions to make bezier knots tangent or symmetric
Add BezCurve tangent/symmetric buttons to Draft.Edit
Draft: added functions to edit tangent or symmetric bezier curves
       changed icon Draft_BezTanNode
       bugfix in Draft BezCurve modifytangentpole
       move poles with knots for Bezier Curves with Degree >=3
       make bezier curves symmetric/tangent when clicking on poles by
           keeping the coordinates of the selected pole
Draft Bezier Curve: implemented Continuity Property

Draft: allow continuity on closed Bezier curves

Draft: BezCurve bugfixes
    - smoothBezCurve
    - edit mode
    - avoid splitting points into segments as long as degree is zero
    - increase the continuity when closing curve
    - closed berzier curves
    - Catch modifications of continuity of first and last knot on open curves