release 1.9.7.rc2
include autobuild's tool-resolution code in autoproj_bootstrap
fix initialization of programs['ruby'] during bootstrap
use Gem.paths to override RubyGems' search path
bootstrap: fix generation of stub env.sh
add ruby 2.0 definition for opensuse
opensuse: handle zypper's 'pattern' in the osdeps system

They have to be prefixed with '@' in the osdeps file.
opensuse: define build-essential