[X] Menu for direct messages
	[X] Commands for new user registration
	[X] If registered/online -- responding to PMs (always require prefix)

[X] Open upstream connections
	[X] when registered users join the groupchat
	[X] open existing connections at app startup

[ ] Handle upstream messages
	[X] System messages
	[X] Public messages
		[X] Coalesce matches from multiple upstream connections (timer?)
		[X] Exclude messages from hub-security (custom nick)
		[X] Allow sending public messages to DC from inside the group chat
		[ ] Nick translation
	[X] Private messages
		[X] Send directly to telegram user account (even if they're telegramuser-on-dc - telegramuser-on-dc PMs i guess)
		[X] Allow replying to PMs with /pm [recipient] message

[ ] Handle inline commands in the group chat
	[ ] /userlist , /userlist@{BOTNAME} - should post the list just to the groupchat? or PM to you
		[ ] Inline message support

[X] Graceful termination
	[X] Ability to close nmdc connections
	[X] Close nmdc connection && deregister user (with bot message) when user leaves groupchat

[X] Block unknown users from entering telegram channel

[ ] Attachment support
	[ ] Telegram -> NMDC
		[ ] Convert telegram files/images/videos to raw URLs for NMDC
		[ ] Bot API does allow downloading - but authenticated - need to re-host (either internally or upload to contented server)
		[ ] Can download up to 20MB files, raise contented limit to match
			[ ] Some photos and stickers come in multiple filesizes, from original down to thumbnail - take the largest size that fits in the Contented limit(?)
		[ ] Display warning in groupchat if message cannot be delivered to native users, or if it was delivered at low fidelity
	[ ] NMDC (Contented) -> Telegram
		[ ] Convert known URLs with image mime type to telegram images??
		[ ] Can upload 5MB photos 20MB other by forwarding an HTTP request
		[ ] Can upload 10MB photos 50MB other by directly uploading
		[ ] Contented /get/ URLs look OK anyway - /p/ links not so much - maybe add meta tags for previewing?
			- OpenGraph http://ogp.me/
			- https://medium.com/@richardoosterhof/how-to-optimize-your-site-for-rich-previews-527ed13a6d69
			- https://stackoverflow.com/a/30160564
			- Supports declaring multiple images on page: http://ogp.me/#array 
	[ ] Including private messages??? is that possible?

[ ] Editing Messages support

[X] Extra DM commands
	[X] Get native userlist
	[X] Check if native user is online
	[X] Get native user description / sharesize / ...

[ ] Drop NMDC connections for inactive users(?)
	[ ] No way to measure inactivity??

[ ] Publish