[PATCH 00/16] git-send-email cleanups

As threatened here's a series that cleans up some of the glaring warts in git-send-email.

Ævar Arnfjörð Bjarmason (16):
  send-email: use lexical filehandle for opendir
  send-email: use lexical filehandles for $compose
  send-email: use lexical filehandles during sending
  send-email: get_patch_subject doesn't need a prototype
  send-email: file_declares_8bit_cte doesn't need a prototype
  send-email: unique_email_list doesn't need a prototype
  send-email: cleanup_compose_files doesn't need a prototype
  send-email: use \E***\Q instead of \*\*\*
  send-email: sanitize_address use $foo, not "$foo"
  send-email: sanitize_address use qq["foo"], not "\"foo\""
  send-email: use (?:) instead of () if no  match variables are needed
  send-email: is_rfc2047_quoted use qr// regexes
  send-email: extract_valid_address use qr// regexes and /o
  send-email: send_message die on $!, not $?
  send-email: make_message_id use "require" instead of "use"
  send-email: use Perl idioms in while loop

 git-send-email.perl   |   80 +++++++++++++++++++++++-------------------------
 t/t9001-send-email.sh |    2 +-
 2 files changed, 39 insertions(+), 43 deletions(-)