Goal here is to better audit plugin and feature versions between GA releases so as to ensure we're conforming to API guidelines for versioning. Ref: JBDS-2212

See http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.pde.doc.user/reference/api-tooling/ant-tasks/analysis-ant-task.htm and http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.5/org.eclipse.pde.api/tools/1.0.100/org/eclipse/pde/api/tools/internal/provisional/problems/IApiProblemTypes.java for values to use in org.eclipse.pde.api.tools.prefs

TODO: set reasonable values so as to get a good report generated here

