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Extend the parser to accept negative options

Introducing negative options for true / false values. The original
getopt_long parser is kept since it is able to set flag-like values
(instead of setting these values in the switch when it's not needed).
The type of the options needed to be changed to integers for getopt_long
to accept flag-like value settings (as per getopt_long documentation,
the address of integer variable has to be passed).

Corresponding negative options are not added for deprecated options.

This patch is a preparation for the addition of configuration files
(GitHub issue #278). General idea of this feature is to have global
configuration files in /etc/criu.d/ directory and user-specific
configuration files in $HOME/.criu.d/ directory, with the possibility
of specifying a chosen file to be used (default files will be used if
none is specified, or none in case the default ones are not present,
to not break compatibility). The options in configuration files should
be possible to be overriden by the options specified on command line,
hence the negative options addition.

The whole feature of configuration files will remove the need of
specifying all the options on command line, with the possibility of
reusing a file for different use case with only overriding some of the
values specified there.

In case both types of option (negative and positive) are passed, the
later one will be applied -- this works with the philosophy of
overriding the "earlier" options from configuration files.

Changes since v1:
- Describe the --no- option prefix in the beginning of OPTIONS section in
  both man page and --help instead of mentioning it at every eligible line
  (this also fixes line length issue with --help)
- Fix the accidental removal of check_only case caused by bad rebase
- Use a macro for getopt_long struct option generating instead of additional
  defines and hardcoded lines

Signed-off-by: Veronika Kabatova <vkabatov@redhat.com>
Signed-off-... (continued)

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