Quick feasibility test for #304
first refactoring towards fixing issue364
throw warning when include file disappears. refactoring.
try to refactor the 'is_modified( includefile )' code
pointer bug
map bug
Added recursion example. Fixes #346
Added tests for linear extrude with scale. Should mostly fix #273
Merge branch 'master' into issue304
make dependency build work for OpenCSG without qmake
update cmake to work with custom built GLU in $BASEDIR
remove debugging assignment
Merge pull request #370 from openscad/gcc110fix

Gcc110fix
Related to #372. Fixes crash on systems where the stack size for new threads is to small
Initial implementation of improved operator handling. Provides the bulk of work for #304
Merge branch 'master' into issue304
Tuning of highlight and background modifiers
Modified tests for #304
re-disabled some nonsensical test combinations
Updated tests as part of #304