Replay the move from revision 8142, because svn does not properly do it.

svn path=/main/branches/prefix/; revision=8205

diff --git a/pym/emerge/__init__.py b/pym/_emerge/__init__.py
similarity index 100%
rename from pym/emerge/__init__.py
rename to pym/_emerge/__init__.py

diff --git a/pym/emerge/help.py b/pym/_emerge/help.py
similarity index 100%
rename from pym/emerge/help.py
rename to pym/_emerge/help.py