- imp.xcodeproj was moved into tools and updated accordingly

- the bin directory finally went away

- IMP::display::ChimeraWriter now supports the latest version of Chimera

- IMP::display::CGOWriter was renamed to IMP::display::PymolWriter as it can do more than just CGO.

- IMP::VectorOfRefCounted::operator[] can now be used for assignments just like a normal vector. No more need to use the IMP::VectorOfRefCounted::set() method.

- the IMP::atom::Hierarchy constructor from an IMP::Particle* is now explicit (as were the ther decorator constructors)