amend! survey: add --top=<N> option and config

survey: add --top=<N> option and config

The 'git survey' builtin provides several detail tables, such as "top
files by on-disk size". The size of these tables defaults to 10,
currently.

Allow the user to specify this number via a new --top=<N> option or the
new survey.top config key.

Signed-off-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

builtin/survey.c

@@ -947,7 +947,7 @@ int cmd_survey(int argc, const char **argv, const char *prefix, struct repositor
 		.opts = {
 			.verbose = 0,
 			.show_progress = -1, /* defaults to isatty(2) */
-			.top_nr = 100,
+			.top_nr = 10,
 
 			.refs.want_all_refs = -1,