openscad/releases/2010.02.md

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* Added functions and statements
* Added sqrt() function
* Added round(), ceil() and floor() functions
* Added lookup() function for linear interpolation in value list
* Added projection(cut = true/false) statement
* Added child() statement for accessing child nodes of module instances
* Added mirror() statement
* Improved DXF import code (more entities and some bugs fixed)
* Added feature for dumping animation as PNG files
* Added a preferences dialog
* Now using CGAL's delaunay tesselator
* Now using eigen2 for linear algebra
* Reorganisation of the source tree
* Some bugs fixed, maybe some new bugs added