• Update to 3.15
• Add extra mirror
• Remove PKGNGPATCH option

Changes:

• The pkgng patch has been fully integrated upstream with its history copied from the pkgng repo over to portmaster's repo
• Add extra messages before/after killing background processes so that 'Terminated' messages look less unexpected
• Fix running from / trying to build the entire tree
• pkgng: Fix -s not respecting the automatic flag
• Fix "Argument list too long" errors
• Add PM_SU_CMD documentation to the sample config file [1]
• Fix -o not showing the specified origin [pkgng patch bug]

Submitted by: Oleg Pudeyev <oleg@bsdpower.com> [1]