print total bt size
lixian_tasks_extended.py -> lixian_extend_links.py
lixian_cli_extended.py -> lixian_commands.py
API to list tasks by category
make sure task type is in lower case
fix #158 and #194: support listing and downloading by category
fix #199: python 2.6 compatibility issue -- dict comprehension was introduced in 2.7
Bug fix: when the network is unavailable, gethostbyname will fail without retry
fix search tasks by date
remove line breaks from base64
Remove duplicate code
refactor lixian_tasks to lixian_query
fix list by status
typo fix
display task #n after added
support extending links in new code
introducing the lixian_plugins system
refactor lixian_commands, next refactoring will make it plugin
make extended commands plugins
support user queries