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reduced output of log messages in status bar


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switched back to tuple as parameter for parallelized functions (necessary for "imap" function in multiprocessing)
fixed small issues of the "cutter.moveto/cutter.drop" transition


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implemented ordered/unordered task result delivery


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adjusted the ContourFollow strategy to use caching properly


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improved uuid handling of Model


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use job IDs to distinguish between remaining cruft from old tasks and results of the current task


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fixed a minor bug reported by "abrom" - thanks!


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* a pstoedit bug in Ubuntu 'lucid' causes a non-zero return code for the eps->dxf conversion
* this exit code (-11) is accepted with a warning now


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forgot to commit the change in the startup script in the previous changeset (fixes a weird namespace issue)
updated the Changelog


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added a Lock to prevent parallel access to the cutter's "moveto" function (this would cause problems with the collision detection)
fixed a weird namespace issue in the startup script


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multi-threading is now configurable via the commandline


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added support for the multiprocessing module (uses multiple processes for calculating ContourFollow toolpaths)


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fixed typo
fixed another floating point inaccuracy issue
replaced full function definitions for "ceil", "sqrt" and "number" with lambda inline functions


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fix floating inaccuracy problem in ContourFollow
added string representation for Bounds instances


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