- unit test for negative cache, stress tests the refcounting.

- fix for refcounting error that could cause fptr_wlist fatal exit
	  in the negative cache rbtree (upcoming 1.1 feature). (Thanks to 
	  Attila Nagy for testing).
	- nicer comments in cachedump about failed RR to string conversion.


git-svn-id: file:///svn/unbound/trunk@1342 be551aaa-1e26-0410-a405-d3ace91eadb9

testcode/unitmain.h

@@ -63,5 +63,7 @@ void dname_test();
 void anchors_test();
 /** unit test for verification functions */
 void verify_test();
+/** unit test for negative cache functions */
+void neg_test();
 
 #endif /* TESTCODE_UNITMAIN_H */