view: reduce redundant attributions in permalink refs
No point in repeating authorship when PATCH messages are
threaded and it's obvious from the top message who the author
is of the series:
[this message] - John Smith @ 2015-09-04 00:04:20 UTC
` [PATCH 1/4] view: eliminate redundant [threaded|flat] link
` [PATCH 2/4] view: one line for thread subjects
` [PATCH 3/4] view: adjust spacing and indentation of index threads
` [PATCH 4/4] view: add missing newline to inline dump