prepare to create coordinate frame demo, minor cleanup for create funcs in demo entries,
fix r2d2.urdf inertia
Merge remote-tracking branch 'bp/master'
fix crash in BasicDemo
add small experiments to distribute points on a sphere
prepare for coordinate frame demo (incomplete)
fix/hack around gwen update of scroll bars and Focu
Merge branch 'master' of https://github.com/erwincoumans/bullet3
fix double precision build
Merge pull request #299 from erwincoumans/master

fix crash in BasicDemo and some other minor things (see commits)