gb-task-check-lastchange: new check for inheritance
http://git.altlinux.org/people/at/packages/girar-builder.git?a=commitdiff;h=132737dc

+#
+# When updating a package V1->V2, last changelog entry in V1
+# must be present among changelog entries in V2.  This is how
+# we can retain NMU and promote QA activity.
+#