remove #preLoadSqueakEnsureGlobalUnderscoreSelectors and postLoadSqueakRestoreGlobalUnderscoreSelectors as fixes for Issue #151 and Issue #158 ... better to use #asSymbol than to rely on preference settings ... lowest common denominator and all that ...
using #asSymbol to create symbols with embedded status to fix both Issue #151 and Issue #158 ... setting preferences doesn't seem to work consistently across Squeak4.x releases
remove Pharo-2.0 from line-up to get green result ... restore when Issue #65 is finally resolved (soon...)