[PATCHv2] tag: add --points-at list option

The following is version 2 of the "points-at" feature.  I think that I've
addressed all of the comments on this discussion other than the name objection.
I suggest "of" instead, as in: "Show me the tags of...".
But, this may be too terse, so I welcome any other suggestions.

Note that this has been rebased onto pu for integration of 'jk/maint-tag-show-fixes'.

Thanks,

Tom Grennan (1):
  tag: add --points-at list option

 Documentation/git-tag.txt |    5 ++-
 builtin/tag.c             |   87 ++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 86 insertions(+), 6 deletions(-)

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1.7.8