New changes in the CVS: The layout of the GCS is now configurable with
an XML file.
This file must be in conf/gcs/, the default is "horizontal.xml" (the
previous layout) which _must_
be present if you want to start gcs without any extra argument.
You can specify your specific layout with the "-layout" option. The
"left_col.xml" is given as a second
The description is done with "rows" and "columns" elements with an
optional size (which is the width for rows and elements of columns, the
height for columns and elements of rows).