Add Eclipse-(PatchFragment|ExtensibleAPI) manifest data

to the jar manifests. Thanks to Jens Offenbach for reporting.

build.gradle

@@ -190,7 +190,8 @@ subprojects {
 (subprojects - project(':core'))*.jar {
 	manifest {
 		attributes('Bundle-SymbolicName': project.group + '-' + project.name,
-				   'Fragment-Host': project.group)
+				   'Fragment-Host': project.group,
+				   'Eclipse-PatchFragment': 'true')
 		from sharedManifest
 	}
 }

core/build.gradle

@@ -15,7 +15,8 @@ dependencies {
 }
 jar {
 	manifest {
-		attributes('Bundle-SymbolicName': project.group)
+		attributes('Bundle-SymbolicName': project.group,
+				   'Eclipse-ExtensibleAPI: true')
 		from sharedManifest
 	}
 }