Add setting to enable/disable extra links on index page

The summary/log/tree links displayed for each repository on the index
page lost some of their purpose when the header menu was added, so this
commit introduces the parameter 'enable-index-links' which must be set
to 1 to enable these links.

Suggested-by: Kristian Høgsberg <krh@bitplanet.net>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/shared.c b/shared.c
index f20fb5c..ab00bc9 100644
--- a/shared.c
+++ b/shared.c
@@ -26,6 +26,7 @@
 
 int cgit_nocache               =  0;
 int cgit_snapshots             =  0;
+int cgit_enable_index_links    =  0;
 int cgit_enable_log_filecount  =  0;
 int cgit_enable_log_linecount  =  0;
 int cgit_max_lock_attempts     =  5;
@@ -146,6 +147,8 @@
 		cgit_nocache = atoi(value);
 	else if (!strcmp(name, "snapshots"))
 		cgit_snapshots = atoi(value);
+	else if (!strcmp(name, "enable-index-links"))
+		cgit_enable_index_links = atoi(value);
 	else if (!strcmp(name, "enable-log-filecount"))
 		cgit_enable_log_filecount = atoi(value);
 	else if (!strcmp(name, "enable-log-linecount"))