Changes on the App side only.
Added two properties:
* AxisLink (accepts an edge - line or arc of circle)
* Symmetric (for distributing the revolution symmetrically in both
directions)
Move from float to double
Further suggestions for float -> double move
Moved Tools2D from float to double
More suggestions for float->double move from Gui subdirectory
Changes to FEM constraint visuals for float->double move
Suggested changes for float -> double move
Suggestions for Part module moving float -> double