Luke: adds get_extended_url to file_sys
Luke: adds get_extended_url to file_sys

get_extended_url Understands the internal file system better and can be
used to get a currect file system url using existing file system
resources.  Example:

path = FileSystem.get_extended_url('RESOURCE:logs/syslogs')
Will return : /tmp/ion/res/logs/syslogs (and the tree will be created)

Luke: deletes no-op

scionrep/scioncc,ooici/pyon,ooici/pyon,crchemist/scioncc,scionrep/scioncc,crchemist/scioncc,mkl-/scioncc,scionrep/scioncc,mkl-/scioncc,mkl-/scioncc,crchemist/scioncc