do string allocations in large pools, allowing to find if a string pertain

* dict.c include/libxml/dict.h: do string allocations in large
  pools, allowing to find if a string pertain to a dict quickly
* xmllint.c: fix --stream --repeat --timing
* Makefile.am: the testThreads run output should be seen.
Daniel
diff --git a/Makefile.am b/Makefile.am
index 05bb587..6fd1879 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -566,10 +566,10 @@
 	@echo "##"
 	@echo "## Threaded regression tests"
 	@echo "##"
-	-@($(CHECKER) $(top_builddir)/testThreads ; \
+	-($(CHECKER) $(top_builddir)/testThreads ; \
 	   grep "MORY ALLO" .memdump  | grep -v "MEMORY ALLOCATED : 0";)
 
-Readertests : testReader$(EXEEXT)
+Readertests : xmllint$(EXEEXT)
 	@(echo > .memdump)
 	@echo "##"
 	@echo "## Reader regression tests"