Added a new directory to work on version 4.0 of SDT.

SDT/schema4.0/etc/anttasks.xml

SDT/schema4.0/etc/common.xml

SDT/schema4.0/etc/dal.rnc

SDT/schema4.0/etc/default.properties

SDT/schema4.0/etc/domain.rnc

SDT/schema4.0/etc/properties.xml

SDT/schema4.0/etc/schema.xmlns

SDT/schema4.0/etc/schemas.xml

SDT/schema4.0/etc/tasks/_addPrivateLibs.xml

SDT/schema4.0/etc/tasks/_buildNative.xml

SDT/schema4.0/etc/tasks/_checkDependentProjects.xml

SDT/schema4.0/etc/tasks/_cleanDependentProjects.xml

SDT/schema4.0/etc/tasks/_getBuildNumber.xml

SDT/schema4.0/etc/tasks/_handleProjectProperties.xml

SDT/schema4.0/etc/tasks/_importManifest.xml

SDT/schema4.0/etc/tasks/_includeExternalResourcesInJar.xml

SDT/schema4.0/etc/tasks/_prepare.xml

SDT/schema4.0/etc/tasks/_preparebuild.xml

SDT/schema4.0/etc/tasks/_setClassPath.xml

SDT/schema4.0/etc/tasks/all.xml