Add new large contributors the AUTHORS, thank you for your work!

Conflicts:
	AUTHORS
Add specific event about conflicts.

Add specific event when a conflict is found during the integrity
check.

Conflicts:
	libpkg/pkg.h.in
Add new event type for conflicts.

Conflicts during integrity check are now handled by special event type:
PKG_EVENT_INTEGRITYCHECK_CONFLICT.
Pkg now produces json event when find such conflict, for example:
{
    "type": "INFO_INTEGRITYCHECK_CONFLICT",
    "data": {
        "pkgname": "memcached",
        "pkgversion": "1.2.8_3",
        "pkgpath": "/usr/local/share/doc/memcached/protocol.txt",
        "conflicts": [
            "memcached-1.4.15"
        ]
    }
}
that allows scripts or side applications to detect conflicts found
during integrity check.

Add -F flag to pkg-upgrade that allows to fetch packages suitable for
upgrade and perform integrity check but skip the installation stage.

Conflicts:
	libpkg/pkgdb.c
	pkg/pkg-upgrade.8
	pkg/upgrade.c
Cosmetic fixes from previous merge
Update my email address.

Use my FreeBSD address, as a more appropriate choice for this project.
Make conflicts events more informative.

Write information about package origins for both packages from the
conflict pair. Now the json variant looks like this:
{
    "type": "INFO_INTEGRITYCHECK_CONFLICT",
    "data": {
        "pkgname": "memcached",
        "pkgversion": "1.2.8_3",
        "pkgorigin": "databases/memcached12",
        "pkgpath": "/usr/local/bin/memcached",
        "conflicts": [
            {
                "name": "memcached",
                "version": "1.4.15",
                "origin": "databases/memcached"
            }
        ]
    }
}

Suggested by:	bapt

Conflicts:
	libpkg/pkgdb.c