Updated cad/klayout to 0.25.4

0.25.4          (2018-08-25):
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/121
      Issue with multiple reads of GDS2 layouts including PCells
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/134
      Error in cell.fill_region caused by big polygon with
      spikes
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/139
      Libraries have not been reassigned when loading a GDS file
      from command line (does not happen on File/Open)
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/141
      Issue with RBA::QHostAddress (ambiguous overload) on Qt5
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/142
      Issue with RBA::RecursiveShapeIterator#region=
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/144
      The Salt package descriptions are not shown with Motif
      style
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/148
      Wrong font is used
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/152
      Shapes#size reported a wrong shape count in viewer mode
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/153
      Application crash when editing guiding shape properties
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/155
      Program freezes after replacing nothing by something in
      Macro editor
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/157
      "Replace cell with ..." rejected cell names with a library
      prefix
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/158
      Repaint issue on cell context
* Bugfix: https://github.com/klayoutmatthias/klayout/issues/159
      Tech specific macros and DRC scripts were not shown in tech
      manager
* Bugfix: 8 bit indexed GIF images can be used for package icons now
* Enhancement: Provide a way to specify the type of a macro
      This feature is mainly useful for command line arguments.
      If you run KLayout with "klayout -b -r myscript"
      it will not be able to determine the type of macro without
      a suffix.

      You can now explicitly specify a certain type by
      giving the suffix implicitly like: "klayout -b -r myscript[rb]"
      This will read "myscript" but pretend it was "myscript.rb"
      and execute it as Ruby script.

      This feature is handy if you need to run a file with a
      specific interpreter but cannot modify the file name.
* Enhancement: Selection now shows PCell display names
      Before, the internal name was shown for instances
* Enhancement: There is an option in the View menu to show or hide markers
      Markers may hide layout under them. With this feature you can
      quickly disable all markers and the layout becomes visible.

(mef)