fixup issue 766
Avoid leaving the first empty document window when opening a file in MDI mode
categorized_examples
example file change
examples showed in separate method
Move offset example into new directory structure.
Add missing DXF file for flat_body.scad (was example009.dxf).
Update to use new faces parameter.
Fix name for STL file.
Don't use deprecated file parameter.
Fix DXF file name.
Output the OpenSCAD version number to console window.
Change diff output to use unified diff format to make it easier to read.
Update test cases.
Fix crash in cgalpngtest_assign-tests
search(): fix crash bug and add additional feature

search(4,[1,2,3]) crashed OpenSCAD. Instead of crashing, one can now search vectors for matching elements.
In addition, search([[1,2]],[[0,1],[1,2],[2,3]]) will work and return [1].
Merge branch 'search_crashfix' of git://github.com/OskarLinde/openscad into OskarLinde-search_crashfix
#786 Added tests
Unset QMAKESPEC to avoid old Qt4 env to bleed over
Merge branch 'close-empty-win-on-open' of git://github.com/OskarLinde/openscad into OskarLinde-close-empty-win-on-open