Dependencies

- Added 'depends' as a valid report column.
- Added 'depends' to the 'long' report.
- Updated hook.format*t unit tests to accommodate new long report.
- Added new join () function that handles std::vector<int>.
- Updated text.t unit tests.

src/tests/hook.format-countdown_compact.t

@@ -35,7 +35,7 @@ if (open my $fh, '>', 'hook.rc')
 {
   print $fh "data.location=.\n",
             "report.long.columns=id,project,priority,entry,start_time,due,",
-              "recur,countdown_compact,age,tags,description\n",
+              "recur,countdown_compact,age,depends,tags,description\n",
             "hooks=on\n",
             "hook.format-countdown_compact=" . $ENV{'PWD'} . "/hook:countdown_compact\n";
   close $fh;