ui-stats: replace 'enable-stats' setting with 'max-stats'

The new 'max-stats' and 'repo.max-stats' settings makes it possible to
define the maximum statistics period, both globally and per repo. Hence,
it is now feasible to allow statistics on repositories with a high commit
frequency, like linux-2.6, by setting repo.max-stats to e.g. 'month'.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cmd.c

@@ -112,10 +112,7 @@ static void snapshot_fn(struct cgit_context *ctx)
 
 static void stats_fn(struct cgit_context *ctx)
 {
-	if (ctx->repo->enable_stats)
-		cgit_show_stats(ctx);
-	else
-		cgit_print_error("Stats disabled for this repo");
+	cgit_show_stats(ctx);
 }
 
 static void summary_fn(struct cgit_context *ctx)