fix the build and document the underlying assumption
diff --git a/releng/map/otdt.map b/releng/map/otdt.map
index 4618d56..00cf54e 100644
--- a/releng/map/otdt.map
+++ b/releng/map/otdt.map
@@ -7,7 +7,10 @@
 

 !-- Also don't use version numbers for those plugins that hold the various otre jars: --

 plugin@org.eclipse.jdt.core,3.7.0.v_OTDT_r200_qualifier=SVN,url=file://localhost/svnroot/tools/org.eclipse.objectteams,path=plugins/org.eclipse.jdt.core

-plugin@org.eclipse.objectteams.otdt,2.0.0=SVN,url=file://localhost/svnroot/tools/org.eclipse.objectteams,path=plugins/org.eclipse.objectteams.otdt

+

+!next plug-in don't specify version so that org.eclipse.objectteams.runtime/customBuildCallbacks.xml will find the plug-in directory:

+plugin@org.eclipse.objectteams.otdt=SVN,url=file://localhost/svnroot/tools/org.eclipse.objectteams,path=plugins/org.eclipse.objectteams.otdt

+

 plugin@org.eclipse.objectteams.otdt.debug,2.0.0=SVN,url=file://localhost/svnroot/tools/org.eclipse.objectteams,path=plugins/org.eclipse.objectteams.otdt.debug

 plugin@org.eclipse.objectteams.otdt.debug.ui,2.0.0=SVN,url=file://localhost/svnroot/tools/org.eclipse.objectteams,path=plugins/org.eclipse.objectteams.otdt.debug.ui

 plugin@org.eclipse.objectteams.otdt.ui,2.0.0=SVN,url=file://localhost/svnroot/tools/org.eclipse.objectteams,path=plugins/org.eclipse.objectteams.otdt.ui