fast-import: use parse_options() for command line options

Previous commits have started to use the parse-options API to display
output from `git fast-import -h` and `git fast-import --help-all` and
to prepare for parsing the command line options using this API.

Let's now actually use the API to parse command line options.

This brings a number of changes that are mostly beneficial:

  - The `--alias`, `--get-mark`, `--cat-blob`, `--ls` and `--notes`
    options are no longer accepted on the command line. They were
    previously accepted as no-ops because parse_argv() fell through to
    parse_one_feature(). They are not documented in the OPTIONS section
    and are only meaningful as in-stream feature assertions, so
    accepting them on the command line was an accident of code sharing
    dating back to 9c8398f0c9 (fast-import: add option command,
    2009-12-04).

  - Abbreviated options like `--dep=5` now work since parse_options()
    allows unambiguous prefixes.

  - As `--cat-blob` is an abbreviation of `--cat-blob-fd`, using the
    former on the command line will fail with "option `cat-blob-fd'
    requires a value" unlike the other four options that are not
    accepted anymore on the command line (see above).

  - Value-taking options now also accept the space-separated
    `--opt value` form, like `--depth 5`, in addition to the
    `--opt=value` form.

  - A bare or trailing `--` is now accepted and the stream is read
    normally, while it used to be a usage error.

  - The error messages for some options might differ a bit.

  - The code is shorter and more standard.

Note that parse_one_feature() is now always called with its
`from_stream` argument set to 1, but the code simplifications that
can be made are left for a following clean-up commit.

Signed-off-by: Christian Couder <christian.couder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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