- update to current 0.18 branch, esp for Qt >= 5.9 fixes
* [TD]Fix slow GC of QGIPrimPath
* [Spreadsheet] Excel File Import fix Py3 bug
* [Path] Fix xrange bug with Py3
* fix print preview function for >= Qt 5.9
* Backport: startwb files restored in 0.18.3 to display thumbs correctly
* 0.18.x displays the example files within in the Start WB without their
respective thumbs. This PR restores that functionality
* Fixed problems with 'pythonopen'
* Correction of drill speed calculation
* Material: py2 fix in depreciated mat file parser (back port from 0.19)
* [TD]Fix #4017 Crash on bad hatch scale