Klayout

* Bugfix: navigator was broken. It was not functional if KLayout was closed
with the navigator open.

* DXF bugfixes (arc interpolation of polylines).
* Performance enhancement of "test for shapes in view" feature of layer list.

* DXF enhancements (support for bulges for polylines).
* Bugfix: RBA::Edge.intersect? reports intersections correctly also if edges
are collinear.
* Performance bugfix: selection was slow for certain cases of hierarchy.

* DXF enhancements (some polylines now have the correct width).
* An option to select how instances are placed (at origin or lower left
corner of bounding box).
* Bugfix: when placing an instance at the lower left bounding box corner,
it is guaranteed that the origin is on grid.
* Stable operation on UTF-8 filesystems and with non-english locales on
Linux (i.e. consistent use of dot as decimal point). However, UTF-8 file
names are not correctly displayed although the file is opened correctly.
This will be fixed in the next major release.

* Correct installation of the image reader plugins for the Windows packages.
* Bugfix: rotate counterclockwise was clockwise and vice versa.
* Bugfix: "draw border instances of arrays" feature was broken.
* Fixed a ruby crash on some systems (related to an initial 'require' on a
ruby module loaded with -rm).
* CIF reader enhancement: "DS" statements are now accepted with a single
value also.
* The Windows installation now also includes the standard Ruby modules.

* DXF reader and writer enhancements. The reader now allows to specify how
POLYLINE entities are read. In most cases, the "Automatic" mode will be
appropriate. The writer was enhanced by providing an option which
determines how to write polygons. The default method is POLYLINE. A
comprehensive description of the DXF format, as KLayout understands it,
together with a description of the modes, is given here.