some name changes inside of pathos.core; increased stability in core;
return connection object instead of response; core.run to core.execute;
more stable getpid; added getppid and getchild; pickport to randomport;
enabled logical defaults and running locally (w/o ssh) on most core functions;
better repr for launchers; launcher.config to launcher.call;
make base Launcher a popen base launcher; removed nodes and nodelist;
clarify command and message api; _fromchild to _stdout; add _pid etc to init;
fgbg to background; rhost to host; some error handling in scripts


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/pathos@667 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/pathos