[MAJOR] remove files distributed under an obscure license

src/chtbl.c, src/hashpjw.c and src/list.c are distributed under
an obscure license. While Aleks and I believe that this license
is OK for haproxy, other people think it is not compatible with
the GPL.

Whether it is or not is not the problem. The fact that it rises
a doubt is sufficient for this problem to be addressed. Arnaud
Cornet rewrote the unclear parts with clean GPLv2 and LGPL code.
The hash algorithm has changed too and the code has been slightly
simplified in the process. A lot of care has been taken in order
to respect the original API as much as possible, including the
LGPL for the exportable parts.

The new code has not been thoroughly tested but it looks OK now.
diff --git a/include/common/appsession.h b/include/common/appsession.h
index 4687298..e77396c 100644
--- a/include/common/appsession.h
+++ b/include/common/appsession.h
@@ -1,15 +1,14 @@
 #ifndef _COMMON_APPSESS_H
 #define _COMMON_APPSESS_H
 
-#define TBLSIZ 10
-#define TBLCHKINT 5000 /* The time between two calls of appsession_refresh in ms */
+/*
+ * The time between two calls of appsession_refresh in ms.
+ */
+#define TBLCHKINT 5000
 
 #include <sys/time.h>
 
-#include <common/chtbl.h>
 #include <common/config.h>
-#include <common/hashpjw.h>
-#include <common/list.h>
 #include <common/memory.h>
 
 #include <types/task.h>
@@ -19,6 +18,7 @@
 	char *serverid;
 	struct timeval expire;		/* next expiration time for this application session */
 	unsigned long int request_count;
+	struct list hash_list;
 } appsess;
 
 extern struct pool_head *pool2_appsess;
@@ -36,11 +36,7 @@
 int match_str(const void *key1, const void *key2);
 
 /* Callback for destroy */
-void destroy(void *data);
-
-#if defined(DEBUG_HASH)
-static void print_table(const CHTbl *htbl);
-#endif
+void destroy(appsess *data);
 
 void appsession_refresh(struct task *t, struct timeval *next);
 int appsession_task_init(void);