Log Message:
Update to gerbv-2.2.0.

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Release Notes for gerbv-2.2.0
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The following is a summary off the changes which went into gerbv-2.2.0.
For a complete list of changes, refer to ChangeLog.

- libgerbv:  fixed a bug in the min/max calculation.
- libgerbv:  improved the ability to parse drill files with
             user specified formats.
- libgerbv:  Compile with -no-undefined to make it easier to build
             windows DLL's.
- configure: Improve detection of tools when cross-compiling.
- libgerbv:  Improved example programs.
- gerbv:     Changed desktop categories to be more consistent with
             the rest of gEDA.
- common:    Fixed compilation with SunPRO compilers
- libgerbv:  Fixed calculation of pick and place bounding box
- gerbv:     Added a rendering benchmark
- gerbv:     Various rendering speed improvements
- common:    Made an install be relocatable.  This is always needed
             for proper win32 operation and helps in some cases
             on other operating systems.  As part of this, improve
             how init.scm is located at startup.
- gerbv:     Improved the project file load/save dialog.