Improve manifold configration UI

< Toba_> some tooltips would probably be great on all those table headers with gray ? next to them
<Toba_> haha so this runs arbitrary js to replace source if it's 'missing'?
< Toba_> you also spelled configurations wrong

so:

Add help tooltips because nobody understands what I'm saying
Add better missing value docs + exclude field
Fix spelling
Fix manifold initial form to check for the null thats there by default and prevent it from shitting the bed

low-prio

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