remove duplicate utility
remove useless parameter
simple query utilities: get_task_by_id and get_task_by_any
- is no option
create_client helper
fix missing argument
fix #241: pending status
print file size when it's wrong in hashing step
upgrade to use latest web interface
fix error message
fix #252: paging
use <tab> to separate output_tasks which is aligned and easy for other
program to parse.