Undone r197 because it is not clear that it works well.
Undone r197 because it is not clear that it works well.

After using the helgrind tool of valgrind suite, I realized that r197
was not thread-safe.  I don't have time now for solving the issue, so
I'm reverting to a job partition based on data sizes, not load-balancing.



git-svn-id: c8706a419b896ba8bc063383f04e6d98ab0b3deb@200 23631f54-0842-0410-b4f0-d76cd42f001b

erdc-cm/numexpr,erdc-cm/numexpr