Linux package build script: Always reset cached copy if invoked from the existing repository.
Fix and enable Integer convert type
Enable reverse manipulations for Integer ValueNode (Real and Angle control points)
Enable reverse manipulations of Scale ValueNode for Real type control points
Add Real convert type, fixes #324

Convert is available for types: Integer, Bool, Angle.
Reverse manipulation supported for Angle handles.
Merge remote-tracking branch 'morevnaproject-synfig/master'