Update to upstream version 2.13

Detailed log:

• New features, see http://www.dhondt.de/new_calc.htm https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222915
• Mark BROKEN on FreeBSD 10 for now: Does not build when built with clang, and causes runtime segfaults when built with gcc

PR: 222915
Submitted by: pfg (maintainer)