add skip plugin options to daq commands; add beamline specific scripts; add command that combines add/update experiment with upload

rename getProcessingPlugins to listProcessingPlugins; completed initial documentation for experiment daq api; add target directory functionality for uploads

enhanced daq processing algorithm to avoid resource starvation between simultaneous DAQs and uploads

added new polling observer agent; enhanced upload functionality to avoid resource starvation with simultaneous daqs and uploads; resolved issue with starting uploads with large number of files in the specified directory