fixup issues 440 441 479
cmd buffer overflow test simplified
Revert "Backported 2e3729ab2268f29ee4ff5898f629c4a10c2d6587 to master; redo assemblePath for Win. redo openscad.com to handle spaces in filenames"

This reverts commit 55192e46a4c0a977b7a9a35650b027c7a410ab14.
Merge branch 'master' of git://github.com/tim-caper/openscad into tim-caper-master