prepare and give Pharo tutorial at ECOOP, Montpellier, France

prepare a Pharo cheat sheet flyer with Damien Pollet and Vincent Blondeau

Pharo launcher: improve code, add tests, and some features

Review many bugs and fixes some

Rewrite all user-directory logic (home, desktop, documents, preferences) to use environment variables (linux, macosx, windows)

Worked with Sebastian on trait-related code (bug fixing mostly)

update pharo vm for ubuntu

�