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largefiles: factor out procedures to update standins for pre-committing

This patch factors out procedures to update standins for
pre-committing. This is one of preparations to avoid execution of such
procedures according to invocation context.

For example, resuming automated committing (e.g. "hg rebase
--continue") should update standins at the 1st commit, because
largefiles in the working directory may be modified manually. But on
the other hand, it should avoid updating standins at subsequent
committings for efficiency reason.

For simplicity, this patch just moves procedures mechanically only
with replacing below.

  - "self"            => "repo"
  - "lfutil."         => (none)
  - "orig" invocation => returning "match"

Using "fstandin" instead "standin" as the name of local variable for
the loop below is the only special care, because the latter shadows
the same name function in "lfutil.py".

  [before]
                for standin in standins:
                    lfile = lfutil.splitstandin(standin)
                    if lfdirstate[lfile] != 'r':
                        lfutil.updatestandin(self, standin)

  [after]
    for fstandin in standins:
        lfile = splitstandin(fstandin)
        if lfdirstate[lfile] != 'r':
            updatestandin(repo, fstandin)

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.