lets you have one distribution containing a non-empty __init__.py for the
package, as long as you call 'declare_namespace()' from that __init__.py
and all other __init__.py files for the namespace package, and do *not*
declare it as a namespace package in setup() (so that it won't be
automatically imported if it's on sys.path, the way empty namespace
packages are.)

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041202