Correction to OGCE 2.3 tar download

The default value for the property <project.home> in ogce-portal-only/pom.xml was incorrectly set. While this can be edited manually, it prevents the portal from building out of the box if one follows the documentation.

Also, the obsolete filetransfer module, which causes the errors described at http://collab-ogce.blogspot.com/2007/12/filetransfer-portlet-build-error.html on some machines, has been removed.

These have been corrected in the download link at http://www.collab-ogce.org/. The version number has been incremented to 2.3.1 to reflect this minor update.