v2, 4 partsVerify GPG signatures when merging and extend %G? pretty string

As suggested by Junio I split the preivous patch into four parts.

Sebastian Götte (4):
  Move commit GPG signature verification to commit.c
  merge/pull: verify GPG signatures of commits being merged
  merge/pull Check for untrusted good GPG signatures
  pretty printing: extend %G? to include 'N' and 'U'

 Documentation/merge-options.txt    |   4 +++
 Documentation/pretty-formats.txt   |   3 +-
 builtin/merge.c                    |  33 +++++++++++++++++-
 commit.c                           |  55 +++++++++++++++++++++++++++++
 commit.h                           |   9 +++++
 git-pull.sh                        |  10 ++++--
 gpg-interface.h                    |   6 ++++
 pretty.c                           |  69 ++++---------------------------------
 t/lib-gpg/pubring.gpg              | Bin 1164 -> 2359 bytes
 t/lib-gpg/random_seed              | Bin 600 -> 600 bytes
 t/lib-gpg/secring.gpg              | Bin 1237 -> 3734 bytes
 t/lib-gpg/trustdb.gpg              | Bin 1280 -> 1360 bytes
 t/t7612-merge-verify-signatures.sh |  61 ++++++++++++++++++++++++++++++++
 13 files changed, 184 insertions(+), 66 deletions(-)
 create mode 100755 t/t7612-merge-verify-signatures.sh