Better debug messages for sending and accepting syncs.  Consistent naming of sync mode

git-svn-id: https://svn.mcs.anl.gov/repos/exm/sfw/lb/trunk@12736 dc4e9af1-7f46-4ead-bba6-71afc04862de
Temporarily disable pruning of builtins

git-svn-id: https://svn.mcs.anl.gov/repos/exm/sfw/lb/trunk@12740 dc4e9af1-7f46-4ead-bba6-71afc04862de