+ issue #0001038: Improve and show List properties in Tree View
+ handle std::exception in Document::slotChangedObject
+ fix build failure
+ extend State attribute of document object
Remove cmake requirement for fortran

Commit b253a148 removed the need for a fortran compiler, but cmake
was still requiring one
Update CMake config to work with smesh 6.5.3.1.

New fork of standalone smesh is available here:
https://github.com/tpaviot/smesh
+ revert PyCXX removal
+ set SMESH include dir when using libpack
+ fix package failure
Ellipse implementation: Art by Jim

- it also includes a shell script equivalent to the UpdateResources.bat for those who use linux
Sketcher New Feature: Ellipse support
- Ellipse introduction button via (center,majaxis extreme, a point in edge), ellipse is always CCW so that Z axis goes in the positive direction of the sketch
- Backwards compatibility with files of previous versions of ellipse not defining a phi angle
- Art by Jim (all the icons you see and the XPMs shown on creation of an ellipse)
- Element Widget support for ellipses
- Box selection for ellipses
- Point on Ellipse constraint based on the gardener's method based on Ulrich's function proposal (radcan simplified, i.e. with simplify_radical sage function)
- Tangent: Ellipse to Line based on DeepSOIC's geometric formulation (radcan simplified)

Sketcher New Feature: Internal Alignment Constraint
- The element to which internal alignment is applied has to be selected last.
- All other elements are added in the order of priority, taking into account existing elements
- Art by Jim (beautiful icons).

Sketcher New Feature: Tool to show/hide/restore the internal geometry of an element
- New functionality for show/hide internal geometry:
  toggles between hiding all unused internal geometry elements and showing all internal geometry.
  The restore function is implicit to the showing all internal geometry

Sketcher New Feature: Arc of Ellipse support
- Part::Geometry + Python implementation
- ArcOfEllipse creation method
- Art by Jim (all the icons you see and the XPMs shown on creation of arc of ellipse elements)
- Sketcher Element widget for ArcOfEllipse.

Bug fix: Select elements associated to constraints works now for foci internal alignment constraints
Sketcher Ellipse bug fix: Jump back on mouseup when shrinked
Sketcher Ellipse and ArcOfEllipse: Major bug fixes
- Change mode so that focus1 is not a point, but two doubles so that visual model and solver model match in number of points.
- Solver fix to deal with reduced constraint partials accuracy (threshold for matrix rank calculation tweak)
- Changes suggested by logari81
Sketcher Ellipse bug fixes:
- Fix of internal geometry creation
- Fix swapped negative and positive ends of major radius line on creation
- Removing the fudge factor (no longer needed)
- Fix to restore internal alignment - autodecide on constraint creation which point of the line is closer to the position
Sketcher Ellipse and ArcOfEllipse: Extra features and bug fixes
- Minor changes to alignment constraint selection to avoid to create objects just for simple calculations
- Equality constraint of Ellipse, ArcOfEllipse and combinations of those elements
- Bugfix for internalalignment creation of major and minor of ellipse and extension to arcofellipse
- Trim support for ellipses
- Solver threshold for rank calculation set at 1e-13.
- Trim support for arc of ellipse
- Ellipses and ArcOfEllipses as external geometry
- Validate Sketch now supports arcs of ellipse
- Tangents of Ellipse or ArcOfEllipse to any of ArcOfcircle, circle and Ellipse (using construction elements)
- Perpendicularity constraint
- Bug fix: Show/hide internal geometry not working for external geometry
- Visualization of Internal alignment constraints when selecting in the constraint widget
- Equality for ellipses and arc of ellipses
Sketcher Ellipse bug fix:
- Fix placement of equality symbols at ellipses and arcs of ellipses
Sketcher Ellipse and ArcOfEllipse: Extra features and bug fixes
- Visual representation of equality constraint: Separate circle and arcofcircle implementation from ellipse and arcofellipse implementation
- Fix for Alignment constraint: Now it allows to assign a second element, one by one
- Box selection for ArcOfEllipses
  Fixes the bug that vertex far away got selected due to lack of sync between the selection and draw loops.
Sketcher: Ellipse enhancement: Negative focus on creation to improve dragging

Focus2 is thrown in automatically for ellipse arcs

(cherry picked from commit 1ab814e6b07fd946dbb2910cc1bfb8588c61afb8)
Sketcher: Ellipse enhancement: All internal geometry is shown on creation

Elements that have internal geometry are created with the internal geometry on creation.

It has been under discussion for a long time. Ulrich was in favour (asked for it several times).
DeepSOIC implemented the focus because he hated the poor dragging of the ellipse when empty.
support for ellipses and elliptical arcs in flattened SVG output
(cherry picked from commit 59eabdbcb043f3d462c3e9ed0ba21cfe65b7aae6)