added RemoveColumnsDialog
added assays and  file refs to experiment profiles
ExperimentProfile stores file columns now;
Added "Add Column" dialog;
better wording
added "create new data assignment column" operation
added file selection cell (naive approach)
code clean up in data assignment view
implemented data assignment columns delete
added data file assignment column update operation
applying data file assignment changes on the server
updating file mappings in experiment profile when uploaded file was removed
added uncaught error handling servlet and jsp
added <dispatcher>ERROR</dispatcher> to the guiceFilter (error page should work now)
showing data files in SDRF preview
fixing SDRF preview
introduced "__UNASSIGNED__@" cell value for SDRF preview (we need to clean it up when exporting)
protocol usage type was changed to protocol target type
added "Assign..." button to protocol rows
added empty protocol assignment dialog
implementing protocol assignments