[Distutils] Changing distribution versions runtime

[bl8cki]

To avoid removing added things in working_set ... i remove the entry for
which i need to switch versions in easy-install.pth and then only
'resolve'-ing and 'add'-ing to the working_set.

I don't know if this (removing the lines in easy-install.pth) will reflect
on easy_install to work properly, but for now i'm happy with this solution
:)

Still will be very thankful for any comments and suggestions.
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