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

reworked catalogging to use collection on a per experiment basis; removed generic apis for retrieving files

added stop-upload command; removed un-needed file stats; improved daq/upload reporting; cleaned up un-needed keys from catalog plugin

added user interfaces and utilities that enable experiment data download from machines that have ssh access to the storage host

added DB and DS web service interfaces for deleting user experiment role; added new delete-user-experiment-role command