Log Message:
Updated cad/klayout 0.25.4 to 0.25.6

0.25.6          (2018-11-23):

* Enhancement: https://github.com/klayoutmatthias/klayout/pull/199
       Added an option to export DXF polygons as LINE objects
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/198
       Stitching of DXF contours wasn't taking nearest neighbours
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/191
       MainWindow/PluginRoot classes got mixed up
       As a side effect of this fix, layout views can now
       be configured individually. This wasn't working
       consistently before.

0.25.5          (2018-10-20):

* Bugfix: https://github.com/klayoutmatthias/klayout/issues/162
       GDS2 LIBNAME was not maintained on "File/Save".
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/166
       Internal error when writing GDS files (breaking of polygons)
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/172
       DEF reader did not pull vias from LEF
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/174
       Performance issue with many layers with width >1
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/176
       Painting issue with texts
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/185
       Hash values available as __hash__ standard method now
       for Python
* Bugfix: some potential memory corruption issues fixed
       During the efforts for making the code base compatible
       with MSVC, some potential candidates for memory corruption
       have been identified and fixed.
       These fixes are included in this release.