inspired by f5e48a3, a seems to work to fix 1076
Merge pull request #1085 from fehknt/master

fix for issue 1076
Bugfix: crash introduced by wipe
Don't wipe if option is disabled
Bugfix: configuration wizard led to crash with simple mode. #1077
Second layer commands were written multiple times
Merge branch 'master' of github.com:alexrj/Slic3r
Bugfix: time estimates for cooling were computed for each object separately instead of the whole actual layer. #1071
Allow 0.1mm slots. #959 #1056
Merge remote-tracking branch 'remotes/upstream/master'