allow I3InfiniteSource's GCD prefixer to be used with I3FileStager

git-svn-id: http://code.icecube.wisc.edu/icetray/projects/dataio/trunk@1814 579d543e-85e3-4578-a5e8-1e6a993b7602
remove sjackso and add dschultz to mailinglist

git-svn-id: http://code.icecube.wisc.edu/icetray/projects/dataio/trunk@1815 579d543e-85e3-4578-a5e8-1e6a993b7602
Fix unicode issues on python 3.


git-svn-id: http://code.icecube.wisc.edu/icetray/projects/dataio/trunk@1816 579d543e-85e3-4578-a5e8-1e6a993b7602