[PATCH 0/14 resend] fork/exec removal series

Here it is again, a series of patches that removes a number fork/exec pairs.

The series goes on top of the builtin-fetch pack topic, specifically, cfa5b2b7f (Avoid scary errors...) and obsoletes q/jsi/no-fork of Lars' patch queue.

The difference compared to the last time I sent are in:

[02/14] Use start_command() in git_connect() instead of explicit fork/exec. [13/14] Avoid a dup2(2) in apply_filter() - start_command() can do it for us. [14/14] Use the asyncronous function infrastructure to run the content filter.

which had conflicts with the strbuf series.

 builtin-archive.c     |    8 +-
 builtin-fetch-pack.c  |  101 +++++++++----------------
 cache.h               |    4 +-
 connect.c             |  128 +++++++++++++++----------------
 convert.c             |   88 ++++++++--------------
 diff.c                |   38 +---------
 peek-remote.c         |    8 +-
 run-command.c         |   78 +++++++++++++++++---
 run-command.h         |   23 ++++++
 send-pack.c           |    8 +-
 t/t0021-conversion.sh |    7 ++-
 transport.c           |    9 +--
 upload-pack.c         |  199 ++++++++++++++++++++++---------------------------
 13 files changed, 332 insertions(+), 367 deletions(-)

-- Hannes