Add const correctness to public interfaces

Gerard Krol, g dot c dot krol at student dot tudelft dot nl

Update version number to 0.9



git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@27 327403b1-1117-474d-bef2-5cb71233fd97

printbuf.c

@@ -40,7 +40,7 @@ struct printbuf* printbuf_new()
 }
 
 
-int printbuf_memappend(struct printbuf *p, char *buf, int size)
+int printbuf_memappend(struct printbuf *p, const char *buf, int size)
 {
   char *t;
   if(p->size - p->bpos <= size) {