Handle large (> 5/10 Mb) CSV files

[rufuspollock]

• Need to be careful re views - we load all of the data into the views and this is fine for SlickGrid but for graphing or maps will be an issue
• (??) Need a streaming csv parser so we don't have the entire file in memory
• Do not load all data for large files (??)
• Use crossfilter (fix to recline ...)