zc.buildout logger.  This reduces noise in the output.  This change
was so far reaching, I decided to go ahead and clean up lots of log
messages, adding some missing periods and adding quotes around
requirement strings and file paths.

in easy_install.py, added logging to show why distributions are added
in verbose mode and removed recusive code to show requirement chains
when errors occurred.


git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@76022 62d5b8a3-27da-0310-9561-8e5933582275