Server/groups comparisons

[hopperelec]

Use examples:

• Compare which guild sends more messages
• Compare sentiment between guilds
• Compare in which guild a user is more active
• Individual 'Server/group growth' per server (right now, this takes into account all servers in the export). These could be overlayed for a better comparison

[mlomb]

I think we can show this stats if there are multiple guilds by default
Also will require a bit of changes to make the graphs stacked
Of course, this should be done after doing #9

[mlomb]

Also we should allow users to select wether they want to stack by channel, by guild, or no stacking at all

[mlomb]

Some advances have been made! #58 brings comparisons in the Timeline cards, that means "Active authors over time" and "Server/group growth" now can compare guilds and groups for Discord and groups in Telegram!
We are missing comparing messages and sentiment.
"Compare in which guild a user is more active" I'm not sure about this one.

Anyway I will keep this issue open but have no plans on continue working in this feature for now.