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.h

@@ -24,7 +24,7 @@ extern struct printbuf*
 printbuf_new(void);
 
 extern int
-printbuf_memappend(struct printbuf *p, char *buf, int size);
+printbuf_memappend(struct printbuf *p, const char *buf, int size);
 
 extern int
 sprintbuf(struct printbuf *p, const char *msg, ...);