Fix recursive include handling by using canonical path (fixes #885).
Update to use boosty.h as older boost versions seem to be still in use.
Save original $fn value for CSG output.
Lower number of segments generated for bezier path.
Handle $fn, $fa and $fs for CSG output.
Merge pull request #896 from openscad/text-fixes-4

Text fixes 4
Merge pull request #886 from openscad/fix-recursive-include

Fix recursive include handling by using canonical path (fixes #885).
Attempted to summarize changes in master
Merge branch 'master' of github.com:openscad/openscad