Log Message:
update to gerbv-2.3.0

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Release Notes for gerbv-2.3.0
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The following is a summary of the changes which went into gerbv-2.3.0.
For a complete list of changes, refer to ChangeLog.

- gerbv:     fixed a minor arc rendering bug in fast mode
- gerbv:     Make the svg/pdf/ps export use a 1:1 scale instead of
             scaling to fit the page.
- configure: Always require cairo now since we make use of some of
             the transformation functions even when using gdk rendering.
- gerbv:     Fix a bug in the vertical scrollbar calculations.
- libgerbv:  Fix a bug where apertures < 10 were potentially ignored in
             some drill files
- gerbv:     Fix clipping bug when viewing files with image offsets
- gerbv:     Fix a bug whereclicking on the message tab caused the keyboard
             accelerators stop working
- gerbv:     Use a reasonable return code when doing command line processing.
- libgerbv:  Improve the macro parser.
- libgerbv:  Allow 0 degree rotation
- libgerbv:  Fix some drill parser bugs
- libgerbv:  Support the Excellon "R" (repeat) command
- testsuite: Add some tests for drill files
- libgerbv:  Fix a bug in the Excellon export which sometimes dropped the first
             element.
- libgerbv:  Fix some additional Excellon export bugs.
- gerbv:     Add the ability to rotate/translate layers
- libgerbv:  Fix the pkgconfig file to include some needed dependencies.