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34e8b4635b
So far I ran 2 or 3 times into the problem that my engine was not up to date. The bad thing here is that there is always an updated version from my PPA on the PC. So first this commit gives the possibility to look for CuraEngine in the $PATH directories. Before I had to copy it always manually, eg. via "cp $(which CuraEngine) bin/CuraEngine" in my workbench. Second, people can get into the situation that CuraEngine is missing at all. So before making Cura loop and try to use an executable that does not exist, better raise an Exception here. An additional info message tells about the location being used. Does not contribute to any JIRA issue (I think), but makes my life easier.