small speedup in skipping blanks characters interning the entities strings

* parser.c: small speedup in skipping blanks characters
* entities.c: interning the entities strings
Daniel
diff --git a/parser.c b/parser.c
index aba212d..39ebf55 100644
--- a/parser.c
+++ b/parser.c
@@ -1389,7 +1389,7 @@
 	int cur;
 	do {
 	    cur = CUR;
-	    while (IS_BLANK(cur)) { /* CHECKED tstblanks.xml */
+	    while (IS_BLANK_CH(cur)) { /* CHECKED tstblanks.xml */
 		NEXT;
 		cur = CUR;
 		res++;