Use the crlf data scripts to produce a corpus of known-good data in
"git" format (aka ODB format) from a variety of files with different
line endings.  `git` created these files running `git add` to stage the
contents then extracting the data from the repository.

We'll use these to ensure that we create identical contents when we add
files into the index.

Re-use the existing crlf data generation script for creating the to-odb
dataset.  Also, store the actual file contents instead of the ID so that
we can identify differences instead of detecting that differences exist.

Include a shell script that will generate the expected data of OIDs and
failures for calling git.git to capture its output as a test resource.

Right now, there is no need to differentiate different systems as git behaves
the same on all systems IIRC.

Signed-off-by: Sven Strickroth <email@cs-ware.de>

Move the crlf_data folders reponsible for holding the state of the
filters going into the working directory to "to_workdir" variations of
the folder name to accommodate future growth into the "to odb" filter
variation.  Update the script to create these new folders as appopriate.

The CRLF data generator is somewhat obscure; add information about how
to use it and what it does.

Update with vanilla Git 2.11.0 on Debian

Signed-off-by: Sven Strickroth <email@cs-ware.de>

Update with "git version 2.11.0.windows.3"

Signed-off-by: Sven Strickroth <email@cs-ware.de>

A corpus of files checked out with Git (Linux, 1.9.1) to ensure that
produce identical data when checking out using a CRLF filter.

A corpus of files checked out with Git for Windows (2.4.1.windows.1)
to ensure that we produce identical data when checking out using a
CRLF filter.