+ update ReadMe and ChangeLog
Arch: disabled buggy wall auto-corners function
+ add further log messages at startup for better troubleshooting, fix possible crash, fix typos
+ workaround for issue with group separator
Add default for path to OpenSCAD on Mac OS X
Raise exception if the OpenSCAD executeable is unavailable
Draft: fix in angular dimension
updated version number in makedist script
Merge branch 'master' into issue1436