Add new period keys early on.

src/brmember-parser.scm

@@ -68,6 +68,15 @@
      (suspendstart suspend start)
      (suspendstop suspend stop)
 
+     (chairstart chair start)
+     (chairstop chair stop)
+     (councilstart council start)
+     (councilstop council stop)
+     (revisionstart revision start)
+     (revisionstop revision stop)
+     (grantstart grant start)
+     (grantstop grant stop)
+     
      (joined member start)
      (destroyed member stop)
      ))