Log Message:
Update pkgin to version 0.9.0.  Changes:

  * Significantly reduce RAM requirements for both "install" and \ 
"update",
    headline number is "pkgin install gcc47" on SmartOS/x86_64 reduces from
    383MB to 14MB, as well as being significantly faster, especially on
    slower hardware.  See my blog post at
    <http://www.perkin.org.uk/posts/reducing-ram-usage-in-pkgin.html> for
    more details.

  * Handle pkg_add signature verification failures.

  * Support pkg_summary.xz if available.

  * Don't switch to parsable output when stdout isn't a tty, which broke
    various automation tools.

  * Integrate patches/patch-external_progressmeter.h

Tested on NetBSD, OSX, and SmartOS.