Adding a separate sort routine for the filter because apparently Mongo can't do case-insensitive sorts.

Signed-off-by: Matt Bernhardt <mjbernha@mit.edu>
Adding a mostly-functional map export to csv.php;
Forcing UTF-8 output for CSV files, trying to trace an encoding problem;
The timeline export is partially rebuilt

Signed-off-by: Matt Bernhardt <mjbernha@mit.edu>