Update DefiningClassMetadata.st
Add version modified for use on Ubuntu
Up to NOF loaded bootstrap runtime
Bootstrap runtime successfully compiles NS3 modules
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Keep 4.2's definition of Dictionary collect:
cleanup
cleaupagain
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nativesession
nativesession
some IDE usability items
nstoolset
Remove old source control link, guess superclass, fix so senders/implementers can find nested classes