Add a 'stats' page to each repo

This new page, which is disabled by default, can be used to print some
statistics about the number of commits per period in the repository,
where period can be either weeks, months, quarters or years.

The function can be activated globally by setting 'enable-stats=1' in
cgitrc and disabled for individual repos by setting 'repo.enable-stats=0'.

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

ui-stats.h

@@ -0,0 +1,8 @@
+#ifndef UI_STATS_H
+#define UI_STATS_H
+
+#include "cgit.h"
+
+extern void cgit_show_stats(struct cgit_context *ctx);
+
+#endif /* UI_STATS_H */