Gate the stats page and add a language breakdown

`max-stats` only bounds the selectable periods now and no longer
doubles as the enable switch.

The tree walk runs before the history walk on purpose. Releasing
commit memory while walking history resets each commit slab index,
and a commit graph lookup afterwards would read another commit slot
and walk the wrong tree. The stats fixture writes a commit graph so
the tests cover that path. The history walk bounds the window in
process rather than passing a formatted since date to
`setup_revisions`, and parses each commit once.

1 file changed, 2 insertions, 0 deletions

diff --git a/source/cgit.h b/source/cgit.h
index 4187bb1..aaf90f8 100644
--- a/source/cgit.h
+++ b/source/cgit.h
@@ -107,6 +107,7 @@ struct cgit_repo {
 	int enable_remote_branches;
 	int enable_subject_links;
 	int enable_html_serving;
+	int enable_stats;
 	int max_stats;
 	int branch_sort;
 	int commit_sort;
@@ -229,6 +230,7 @@ struct cgit_config {
 	int enable_filter_overrides;
 	int enable_follow_links;
 	int enable_help;
+	int enable_stats;
 	int enable_http_clone;
 	int enable_index_links;
 	int enable_index_owner;