- as bootstrap is passing -S to generated bin/buildout there is not need to
   use it while invoking bin/buildout
 - as new buildout will only select non-development releases there is no need
   to pin to known release
 - fix Zope KGS issues with buildout 1.5.0
 - use distribute by default, as it is more reliable in corner cases then
   setuptools
 - inform about another way to updating local bootstrap


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38044 20353a03-c40f-0410-a6d1-a30d3c3de9de