www/piwigo: update 2.6.3 -> 2.7.1

- Change maintainership to tremere@cainites.net (maintainer approved)
- Drop @dirrm usage from pkg-plist

PR:		194614
Submitted by:	Ralf van der Enden <tremere@cainites.net>
Approved by:	mentors (implicit)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@372520 35697150-7ecd-e111-bb59-0022644237b5