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fixup issue 593
Regression test for 2D intersection() operation
Regression fix: n-ary 2d intersection() with n != 2
Create freenode-verification.txt
removed temporary file
Moved special handling of intersection to ClipperUtils
Short-circuit zero scaled 2D objects
redo assemblePath for Win. redo openscad.com to handle spaces in filenames
fixup 593 revised
Made executable
build on system without OpenGL. do cmake .. -DNULLGL=1
add PRINTD to printutils.cc
add PRINTD to printutils.h
add '--debug=' option to openscad cmdline. see printutils.h for usage
add global OpenSCAD::debug string to printutils.cc (see printutils.h for usage)
replace logstream with PRINTD / PRINTDB . add boost include to printutils.cc
fix PRINTD to PRINTDB
bugfix: When trying to copy Nef polyhderons, we were just copying pointers, defeating the const
Merge pull request #624 from openscad/issue598cmdline

Issue598cmdline