Merge branch 'maint'

* maint:
  GIT 1.6.4.3
  svn: properly escape arguments for authors-prog
  http.c: remove verification of remote packs
  grep: accept relative paths outside current working directory
  grep: fix exit status if external_grep() punts

Conflicts:
	GIT-VERSION-GEN
	RelNotes

grep.h

@@ -59,6 +59,7 @@ struct grep_opt {
 	struct grep_pat *pattern_list;
 	struct grep_pat **pattern_tail;
 	struct grep_expr *pattern_expression;
+	const char *prefix;
 	int prefix_length;
 	regex_t regexp;
 	int linenum;