This series is reroll of previous version of smart transport extensions,
with various technical nits addressed and some errors fixed. Also rebased
on top of latest next.

Major changes:
- Service names now have 'git-' prefix.
- Successful response to <connect> is "", not "OK".
- Removed <connect> "ERROR" response.
- <connect-r> renamed to <connect>.
- <invoke-r> removed. Pass service executable as option "servpath" instead.
- HTTP helpers are now hardlinked if possible (copied if not).
- Revert the changes to invoking helpers (see known issues)


Known issues (not caused by this code and does not need this code to be
visible):
- Segfaults when closing transports, caused by double-frees
- Funky error message if trying to use not-present helper.


Ilari Liusvaara (8):
  Pass unknown protocols to external protocol handlers
  Refactor git transport options parsing
  Support taking over transports
  Support remote helpers implementing smart transports
  Support remote archive from external protocol helpers
  Remove special casing of http, https and ftp
  Add remote helper debug mode
  Support mandatory capabilities

 .gitignore                           |    4 +
 Documentation/git-remote-helpers.txt |   36 +++++-
 Makefile                             |   24 +++-
 builtin-archive.c                    |   17 ++-
 transport-helper.c                   |  261 +++++++++++++++++++++++++++++-----
 transport.c                          |  258 +++++++++++++++++++++++++++------
 transport.h                          |   32 ++++
 7 files changed, 540 insertions(+), 92 deletions(-)

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