Refs #100576, 100651, 100655, 100666, 100668, 100670. Bump CCN_API_VERSION to 5001.

Covers these changes from 0.5.0 to 0.5.1:
100670	SyncTest.localStore does not set scope
100668	implement destroyface in ccndc
100666	ccnd should provide a way to specify default staleness
100655	RootAdvise exclusion lists can become too long
100651	autoreg does not work for link adaptor faces

Author: Michael Plass

csrc/include/ccn/ccn.h

@@ -37,7 +37,7 @@
  * Thus CCN_API_VERSION=1000 would have corresponded to the first public
  * release (0.1.0), but that version did not have this macro defined.
  */
-#define CCN_API_VERSION 5000
+#define CCN_API_VERSION 5001
 
 /**
  * Interest lifetime default.