[MEDIUM] many cleanups in the time functions

Now, functions whose name begins with '__tv_' are inlined. Also,
'tv_ms' is used as a prefix for functions using milliseconds.
diff --git a/src/haproxy.c b/src/haproxy.c
index 5776d18..a2e335e 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -281,7 +281,7 @@
 		qfprintf(stderr,"[dump] wq: task %p, still %ld ms, "
 			 "cli=%d, srv=%d, cr=%d, cw=%d, sr=%d, sw=%d, "
 			 "req=%d, rep=%d, clifd=%d\n",
-			 s, tv_remain(&now, &t->expire),
+			 s, tv_ms_remain(&now, &t->expire),
 			 s->cli_state,
 			 s->srv_state,
 			 EV_FD_ISSET(s->cli_fd, DIR_RD),