New "di" command to download video/playlist info #745
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/commands/misc.py:
New function item_info() (derived from the old video_info()),
used by the new "i" and "di" commands
Refactored "i" command: new function display_item_info()
New "di" command: new functions download_item_info()
and download_item_info_many()
/commands/download.py:
(used by "di" to create the name for playlist info files,
using the playlist title)
helptext.py: document the new "di" command